diff --git a/.idea/artifacts/kelp_additional_algorithms_jar.xml b/.idea/artifacts/kelp_additional_algorithms_jar.xml
new file mode 100644
index 0000000..f9d5c0a
--- /dev/null
+++ b/.idea/artifacts/kelp_additional_algorithms_jar.xml
@@ -0,0 +1,8 @@
+<component name="ArtifactManager">
+  <artifact type="jar" name="kelp-additional-algorithms:jar">
+    <output-path>$PROJECT_DIR$/../jars/</output-path>
+    <root id="archive" name="kelp-additional-algorithms.jar">
+      <element id="module-output" name="kelp-additional-algorithms" />
+    </root>
+  </artifact>
+</component>
\ No newline at end of file
diff --git a/.idea/checkstyle-idea.xml b/.idea/checkstyle-idea.xml
new file mode 100644
index 0000000..a6944f6
--- /dev/null
+++ b/.idea/checkstyle-idea.xml
@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="CheckStyle-IDEA">
+    <option name="configuration">
+      <map>
+        <entry key="location-0" value="CLASSPATH:/sun_checks.xml:The default Checkstyle rules" />
+      </map>
+    </option>
+  </component>
+</project>
\ No newline at end of file
diff --git a/.idea/libraries/Maven__com_fasterxml_jackson_core_jackson_annotations_2_6_0.xml b/.idea/libraries/Maven__com_fasterxml_jackson_core_jackson_annotations_2_6_0.xml
new file mode 100644
index 0000000..cc9065d
--- /dev/null
+++ b/.idea/libraries/Maven__com_fasterxml_jackson_core_jackson_annotations_2_6_0.xml
@@ -0,0 +1,13 @@
+<component name="libraryTable">
+  <library name="Maven: com.fasterxml.jackson.core:jackson-annotations:2.6.0">
+    <CLASSES>
+      <root url="jar://$MAVEN_REPOSITORY$/com/fasterxml/jackson/core/jackson-annotations/2.6.0/jackson-annotations-2.6.0.jar!/" />
+    </CLASSES>
+    <JAVADOC>
+      <root url="jar://$MAVEN_REPOSITORY$/com/fasterxml/jackson/core/jackson-annotations/2.6.0/jackson-annotations-2.6.0-javadoc.jar!/" />
+    </JAVADOC>
+    <SOURCES>
+      <root url="jar://$MAVEN_REPOSITORY$/com/fasterxml/jackson/core/jackson-annotations/2.6.0/jackson-annotations-2.6.0-sources.jar!/" />
+    </SOURCES>
+  </library>
+</component>
\ No newline at end of file
diff --git a/.idea/libraries/Maven__com_fasterxml_jackson_core_jackson_core_2_6_4.xml b/.idea/libraries/Maven__com_fasterxml_jackson_core_jackson_core_2_6_4.xml
new file mode 100644
index 0000000..fdba752
--- /dev/null
+++ b/.idea/libraries/Maven__com_fasterxml_jackson_core_jackson_core_2_6_4.xml
@@ -0,0 +1,13 @@
+<component name="libraryTable">
+  <library name="Maven: com.fasterxml.jackson.core:jackson-core:2.6.4">
+    <CLASSES>
+      <root url="jar://$MAVEN_REPOSITORY$/com/fasterxml/jackson/core/jackson-core/2.6.4/jackson-core-2.6.4.jar!/" />
+    </CLASSES>
+    <JAVADOC>
+      <root url="jar://$MAVEN_REPOSITORY$/com/fasterxml/jackson/core/jackson-core/2.6.4/jackson-core-2.6.4-javadoc.jar!/" />
+    </JAVADOC>
+    <SOURCES>
+      <root url="jar://$MAVEN_REPOSITORY$/com/fasterxml/jackson/core/jackson-core/2.6.4/jackson-core-2.6.4-sources.jar!/" />
+    </SOURCES>
+  </library>
+</component>
\ No newline at end of file
diff --git a/.idea/libraries/Maven__com_fasterxml_jackson_core_jackson_databind_2_6_4.xml b/.idea/libraries/Maven__com_fasterxml_jackson_core_jackson_databind_2_6_4.xml
new file mode 100644
index 0000000..b74b06d
--- /dev/null
+++ b/.idea/libraries/Maven__com_fasterxml_jackson_core_jackson_databind_2_6_4.xml
@@ -0,0 +1,13 @@
+<component name="libraryTable">
+  <library name="Maven: com.fasterxml.jackson.core:jackson-databind:2.6.4">
+    <CLASSES>
+      <root url="jar://$MAVEN_REPOSITORY$/com/fasterxml/jackson/core/jackson-databind/2.6.4/jackson-databind-2.6.4.jar!/" />
+    </CLASSES>
+    <JAVADOC>
+      <root url="jar://$MAVEN_REPOSITORY$/com/fasterxml/jackson/core/jackson-databind/2.6.4/jackson-databind-2.6.4-javadoc.jar!/" />
+    </JAVADOC>
+    <SOURCES>
+      <root url="jar://$MAVEN_REPOSITORY$/com/fasterxml/jackson/core/jackson-databind/2.6.4/jackson-databind-2.6.4-sources.jar!/" />
+    </SOURCES>
+  </library>
+</component>
\ No newline at end of file
diff --git a/.idea/libraries/Maven__com_google_code_findbugs_jsr305_1_3_9.xml b/.idea/libraries/Maven__com_google_code_findbugs_jsr305_1_3_9.xml
new file mode 100644
index 0000000..0e66824
--- /dev/null
+++ b/.idea/libraries/Maven__com_google_code_findbugs_jsr305_1_3_9.xml
@@ -0,0 +1,13 @@
+<component name="libraryTable">
+  <library name="Maven: com.google.code.findbugs:jsr305:1.3.9">
+    <CLASSES>
+      <root url="jar://$MAVEN_REPOSITORY$/com/google/code/findbugs/jsr305/1.3.9/jsr305-1.3.9.jar!/" />
+    </CLASSES>
+    <JAVADOC>
+      <root url="jar://$MAVEN_REPOSITORY$/com/google/code/findbugs/jsr305/1.3.9/jsr305-1.3.9-javadoc.jar!/" />
+    </JAVADOC>
+    <SOURCES>
+      <root url="jar://$MAVEN_REPOSITORY$/com/google/code/findbugs/jsr305/1.3.9/jsr305-1.3.9-sources.jar!/" />
+    </SOURCES>
+  </library>
+</component>
\ No newline at end of file
diff --git a/.idea/libraries/Maven__com_google_guava_guava_11_0_2.xml b/.idea/libraries/Maven__com_google_guava_guava_11_0_2.xml
new file mode 100644
index 0000000..01a573a
--- /dev/null
+++ b/.idea/libraries/Maven__com_google_guava_guava_11_0_2.xml
@@ -0,0 +1,13 @@
+<component name="libraryTable">
+  <library name="Maven: com.google.guava:guava:11.0.2">
+    <CLASSES>
+      <root url="jar://$MAVEN_REPOSITORY$/com/google/guava/guava/11.0.2/guava-11.0.2.jar!/" />
+    </CLASSES>
+    <JAVADOC>
+      <root url="jar://$MAVEN_REPOSITORY$/com/google/guava/guava/11.0.2/guava-11.0.2-javadoc.jar!/" />
+    </JAVADOC>
+    <SOURCES>
+      <root url="jar://$MAVEN_REPOSITORY$/com/google/guava/guava/11.0.2/guava-11.0.2-sources.jar!/" />
+    </SOURCES>
+  </library>
+</component>
\ No newline at end of file
diff --git a/.idea/libraries/Maven__com_googlecode_efficient_java_matrix_library_ejml_0_24.xml b/.idea/libraries/Maven__com_googlecode_efficient_java_matrix_library_ejml_0_24.xml
new file mode 100644
index 0000000..c953dde
--- /dev/null
+++ b/.idea/libraries/Maven__com_googlecode_efficient_java_matrix_library_ejml_0_24.xml
@@ -0,0 +1,13 @@
+<component name="libraryTable">
+  <library name="Maven: com.googlecode.efficient-java-matrix-library:ejml:0.24">
+    <CLASSES>
+      <root url="jar://$MAVEN_REPOSITORY$/com/googlecode/efficient-java-matrix-library/ejml/0.24/ejml-0.24.jar!/" />
+    </CLASSES>
+    <JAVADOC>
+      <root url="jar://$MAVEN_REPOSITORY$/com/googlecode/efficient-java-matrix-library/ejml/0.24/ejml-0.24-javadoc.jar!/" />
+    </JAVADOC>
+    <SOURCES>
+      <root url="jar://$MAVEN_REPOSITORY$/com/googlecode/efficient-java-matrix-library/ejml/0.24/ejml-0.24-sources.jar!/" />
+    </SOURCES>
+  </library>
+</component>
\ No newline at end of file
diff --git a/.idea/libraries/Maven__dom4j_dom4j_1_6_1.xml b/.idea/libraries/Maven__dom4j_dom4j_1_6_1.xml
new file mode 100644
index 0000000..14681ee
--- /dev/null
+++ b/.idea/libraries/Maven__dom4j_dom4j_1_6_1.xml
@@ -0,0 +1,13 @@
+<component name="libraryTable">
+  <library name="Maven: dom4j:dom4j:1.6.1">
+    <CLASSES>
+      <root url="jar://$MAVEN_REPOSITORY$/dom4j/dom4j/1.6.1/dom4j-1.6.1.jar!/" />
+    </CLASSES>
+    <JAVADOC>
+      <root url="jar://$MAVEN_REPOSITORY$/dom4j/dom4j/1.6.1/dom4j-1.6.1-javadoc.jar!/" />
+    </JAVADOC>
+    <SOURCES>
+      <root url="jar://$MAVEN_REPOSITORY$/dom4j/dom4j/1.6.1/dom4j-1.6.1-sources.jar!/" />
+    </SOURCES>
+  </library>
+</component>
\ No newline at end of file
diff --git a/.idea/libraries/Maven__it_uniroma2_sag_kelp_kelp_core_2_0_1.xml b/.idea/libraries/Maven__it_uniroma2_sag_kelp_kelp_core_2_0_1.xml
new file mode 100644
index 0000000..4ae2992
--- /dev/null
+++ b/.idea/libraries/Maven__it_uniroma2_sag_kelp_kelp_core_2_0_1.xml
@@ -0,0 +1,13 @@
+<component name="libraryTable">
+  <library name="Maven: it.uniroma2.sag.kelp:kelp-core:2.0.1">
+    <CLASSES>
+      <root url="jar://$MAVEN_REPOSITORY$/it/uniroma2/sag/kelp/kelp-core/2.0.1/kelp-core-2.0.1.jar!/" />
+    </CLASSES>
+    <JAVADOC>
+      <root url="jar://$MAVEN_REPOSITORY$/it/uniroma2/sag/kelp/kelp-core/2.0.1/kelp-core-2.0.1-javadoc.jar!/" />
+    </JAVADOC>
+    <SOURCES>
+      <root url="jar://$MAVEN_REPOSITORY$/it/uniroma2/sag/kelp/kelp-core/2.0.1/kelp-core-2.0.1-sources.jar!/" />
+    </SOURCES>
+  </library>
+</component>
\ No newline at end of file
diff --git a/.idea/libraries/Maven__junit_junit_4_11.xml b/.idea/libraries/Maven__junit_junit_4_11.xml
new file mode 100644
index 0000000..f33320d
--- /dev/null
+++ b/.idea/libraries/Maven__junit_junit_4_11.xml
@@ -0,0 +1,13 @@
+<component name="libraryTable">
+  <library name="Maven: junit:junit:4.11">
+    <CLASSES>
+      <root url="jar://$MAVEN_REPOSITORY$/junit/junit/4.11/junit-4.11.jar!/" />
+    </CLASSES>
+    <JAVADOC>
+      <root url="jar://$MAVEN_REPOSITORY$/junit/junit/4.11/junit-4.11-javadoc.jar!/" />
+    </JAVADOC>
+    <SOURCES>
+      <root url="jar://$MAVEN_REPOSITORY$/junit/junit/4.11/junit-4.11-sources.jar!/" />
+    </SOURCES>
+  </library>
+</component>
\ No newline at end of file
diff --git a/.idea/libraries/Maven__net_sf_trove4j_trove4j_3_0_3.xml b/.idea/libraries/Maven__net_sf_trove4j_trove4j_3_0_3.xml
new file mode 100644
index 0000000..72d4d7e
--- /dev/null
+++ b/.idea/libraries/Maven__net_sf_trove4j_trove4j_3_0_3.xml
@@ -0,0 +1,13 @@
+<component name="libraryTable">
+  <library name="Maven: net.sf.trove4j:trove4j:3.0.3">
+    <CLASSES>
+      <root url="jar://$MAVEN_REPOSITORY$/net/sf/trove4j/trove4j/3.0.3/trove4j-3.0.3.jar!/" />
+    </CLASSES>
+    <JAVADOC>
+      <root url="jar://$MAVEN_REPOSITORY$/net/sf/trove4j/trove4j/3.0.3/trove4j-3.0.3-javadoc.jar!/" />
+    </JAVADOC>
+    <SOURCES>
+      <root url="jar://$MAVEN_REPOSITORY$/net/sf/trove4j/trove4j/3.0.3/trove4j-3.0.3-sources.jar!/" />
+    </SOURCES>
+  </library>
+</component>
\ No newline at end of file
diff --git a/.idea/libraries/Maven__org_apache_commons_commons_lang3_3_4.xml b/.idea/libraries/Maven__org_apache_commons_commons_lang3_3_4.xml
new file mode 100644
index 0000000..78cfcd3
--- /dev/null
+++ b/.idea/libraries/Maven__org_apache_commons_commons_lang3_3_4.xml
@@ -0,0 +1,13 @@
+<component name="libraryTable">
+  <library name="Maven: org.apache.commons:commons-lang3:3.4">
+    <CLASSES>
+      <root url="jar://$MAVEN_REPOSITORY$/org/apache/commons/commons-lang3/3.4/commons-lang3-3.4.jar!/" />
+    </CLASSES>
+    <JAVADOC>
+      <root url="jar://$MAVEN_REPOSITORY$/org/apache/commons/commons-lang3/3.4/commons-lang3-3.4-javadoc.jar!/" />
+    </JAVADOC>
+    <SOURCES>
+      <root url="jar://$MAVEN_REPOSITORY$/org/apache/commons/commons-lang3/3.4/commons-lang3-3.4-sources.jar!/" />
+    </SOURCES>
+  </library>
+</component>
\ No newline at end of file
diff --git a/.idea/libraries/Maven__org_apache_commons_commons_math3_3_2.xml b/.idea/libraries/Maven__org_apache_commons_commons_math3_3_2.xml
new file mode 100644
index 0000000..dde81ab
--- /dev/null
+++ b/.idea/libraries/Maven__org_apache_commons_commons_math3_3_2.xml
@@ -0,0 +1,13 @@
+<component name="libraryTable">
+  <library name="Maven: org.apache.commons:commons-math3:3.2">
+    <CLASSES>
+      <root url="jar://$MAVEN_REPOSITORY$/org/apache/commons/commons-math3/3.2/commons-math3-3.2.jar!/" />
+    </CLASSES>
+    <JAVADOC>
+      <root url="jar://$MAVEN_REPOSITORY$/org/apache/commons/commons-math3/3.2/commons-math3-3.2-javadoc.jar!/" />
+    </JAVADOC>
+    <SOURCES>
+      <root url="jar://$MAVEN_REPOSITORY$/org/apache/commons/commons-math3/3.2/commons-math3-3.2-sources.jar!/" />
+    </SOURCES>
+  </library>
+</component>
\ No newline at end of file
diff --git a/.idea/libraries/Maven__org_hamcrest_hamcrest_core_1_3.xml b/.idea/libraries/Maven__org_hamcrest_hamcrest_core_1_3.xml
new file mode 100644
index 0000000..f58bbc1
--- /dev/null
+++ b/.idea/libraries/Maven__org_hamcrest_hamcrest_core_1_3.xml
@@ -0,0 +1,13 @@
+<component name="libraryTable">
+  <library name="Maven: org.hamcrest:hamcrest-core:1.3">
+    <CLASSES>
+      <root url="jar://$MAVEN_REPOSITORY$/org/hamcrest/hamcrest-core/1.3/hamcrest-core-1.3.jar!/" />
+    </CLASSES>
+    <JAVADOC>
+      <root url="jar://$MAVEN_REPOSITORY$/org/hamcrest/hamcrest-core/1.3/hamcrest-core-1.3-javadoc.jar!/" />
+    </JAVADOC>
+    <SOURCES>
+      <root url="jar://$MAVEN_REPOSITORY$/org/hamcrest/hamcrest-core/1.3/hamcrest-core-1.3-sources.jar!/" />
+    </SOURCES>
+  </library>
+</component>
\ No newline at end of file
diff --git a/.idea/libraries/Maven__org_javassist_javassist_3_16_1_GA.xml b/.idea/libraries/Maven__org_javassist_javassist_3_16_1_GA.xml
new file mode 100644
index 0000000..7b4e548
--- /dev/null
+++ b/.idea/libraries/Maven__org_javassist_javassist_3_16_1_GA.xml
@@ -0,0 +1,13 @@
+<component name="libraryTable">
+  <library name="Maven: org.javassist:javassist:3.16.1-GA">
+    <CLASSES>
+      <root url="jar://$MAVEN_REPOSITORY$/org/javassist/javassist/3.16.1-GA/javassist-3.16.1-GA.jar!/" />
+    </CLASSES>
+    <JAVADOC>
+      <root url="jar://$MAVEN_REPOSITORY$/org/javassist/javassist/3.16.1-GA/javassist-3.16.1-GA-javadoc.jar!/" />
+    </JAVADOC>
+    <SOURCES>
+      <root url="jar://$MAVEN_REPOSITORY$/org/javassist/javassist/3.16.1-GA/javassist-3.16.1-GA-sources.jar!/" />
+    </SOURCES>
+  </library>
+</component>
\ No newline at end of file
diff --git a/.idea/libraries/Maven__org_reflections_reflections_0_9_9_RC1.xml b/.idea/libraries/Maven__org_reflections_reflections_0_9_9_RC1.xml
new file mode 100644
index 0000000..95dd64a
--- /dev/null
+++ b/.idea/libraries/Maven__org_reflections_reflections_0_9_9_RC1.xml
@@ -0,0 +1,13 @@
+<component name="libraryTable">
+  <library name="Maven: org.reflections:reflections:0.9.9-RC1">
+    <CLASSES>
+      <root url="jar://$MAVEN_REPOSITORY$/org/reflections/reflections/0.9.9-RC1/reflections-0.9.9-RC1.jar!/" />
+    </CLASSES>
+    <JAVADOC>
+      <root url="jar://$MAVEN_REPOSITORY$/org/reflections/reflections/0.9.9-RC1/reflections-0.9.9-RC1-javadoc.jar!/" />
+    </JAVADOC>
+    <SOURCES>
+      <root url="jar://$MAVEN_REPOSITORY$/org/reflections/reflections/0.9.9-RC1/reflections-0.9.9-RC1-sources.jar!/" />
+    </SOURCES>
+  </library>
+</component>
\ No newline at end of file
diff --git a/.idea/libraries/Maven__org_slf4j_slf4j_api_1_7_7.xml b/.idea/libraries/Maven__org_slf4j_slf4j_api_1_7_7.xml
new file mode 100644
index 0000000..1e67260
--- /dev/null
+++ b/.idea/libraries/Maven__org_slf4j_slf4j_api_1_7_7.xml
@@ -0,0 +1,13 @@
+<component name="libraryTable">
+  <library name="Maven: org.slf4j:slf4j-api:1.7.7">
+    <CLASSES>
+      <root url="jar://$MAVEN_REPOSITORY$/org/slf4j/slf4j-api/1.7.7/slf4j-api-1.7.7.jar!/" />
+    </CLASSES>
+    <JAVADOC>
+      <root url="jar://$MAVEN_REPOSITORY$/org/slf4j/slf4j-api/1.7.7/slf4j-api-1.7.7-javadoc.jar!/" />
+    </JAVADOC>
+    <SOURCES>
+      <root url="jar://$MAVEN_REPOSITORY$/org/slf4j/slf4j-api/1.7.7/slf4j-api-1.7.7-sources.jar!/" />
+    </SOURCES>
+  </library>
+</component>
\ No newline at end of file
diff --git a/.idea/libraries/Maven__org_slf4j_slf4j_simple_1_7_7.xml b/.idea/libraries/Maven__org_slf4j_slf4j_simple_1_7_7.xml
new file mode 100644
index 0000000..7f7a926
--- /dev/null
+++ b/.idea/libraries/Maven__org_slf4j_slf4j_simple_1_7_7.xml
@@ -0,0 +1,13 @@
+<component name="libraryTable">
+  <library name="Maven: org.slf4j:slf4j-simple:1.7.7">
+    <CLASSES>
+      <root url="jar://$MAVEN_REPOSITORY$/org/slf4j/slf4j-simple/1.7.7/slf4j-simple-1.7.7.jar!/" />
+    </CLASSES>
+    <JAVADOC>
+      <root url="jar://$MAVEN_REPOSITORY$/org/slf4j/slf4j-simple/1.7.7/slf4j-simple-1.7.7-javadoc.jar!/" />
+    </JAVADOC>
+    <SOURCES>
+      <root url="jar://$MAVEN_REPOSITORY$/org/slf4j/slf4j-simple/1.7.7/slf4j-simple-1.7.7-sources.jar!/" />
+    </SOURCES>
+  </library>
+</component>
\ No newline at end of file
diff --git a/.idea/libraries/Maven__xml_apis_xml_apis_1_0_b2.xml b/.idea/libraries/Maven__xml_apis_xml_apis_1_0_b2.xml
new file mode 100644
index 0000000..c36e717
--- /dev/null
+++ b/.idea/libraries/Maven__xml_apis_xml_apis_1_0_b2.xml
@@ -0,0 +1,13 @@
+<component name="libraryTable">
+  <library name="Maven: xml-apis:xml-apis:1.0.b2">
+    <CLASSES>
+      <root url="jar://$MAVEN_REPOSITORY$/xml-apis/xml-apis/1.0.b2/xml-apis-1.0.b2.jar!/" />
+    </CLASSES>
+    <JAVADOC>
+      <root url="jar://$MAVEN_REPOSITORY$/xml-apis/xml-apis/1.0.b2/xml-apis-1.0.b2-javadoc.jar!/" />
+    </JAVADOC>
+    <SOURCES>
+      <root url="jar://$MAVEN_REPOSITORY$/xml-apis/xml-apis/1.0.b2/xml-apis-1.0.b2-sources.jar!/" />
+    </SOURCES>
+  </library>
+</component>
\ No newline at end of file
diff --git a/pom.xml b/pom.xml
index 35754b0..8cf500f 100644
--- a/pom.xml
+++ b/pom.xml
@@ -1,5 +1,5 @@
 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+		 xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
 	<modelVersion>4.0.0</modelVersion>
 	<groupId>it.uniroma2.sag.kelp</groupId>
 	<artifactId>kelp-additional-algorithms</artifactId>
@@ -86,6 +86,31 @@
 			<artifactId>kelp-core</artifactId>
 			<version>2.0.1</version>
 		</dependency>
+		<dependency>
+			<groupId>org.apache.commons</groupId>
+			<artifactId>commons-lang3</artifactId>
+			<version>3.4</version>
+		</dependency>
+		<dependency>
+			<groupId>org.slf4j</groupId>
+			<artifactId>slf4j-api</artifactId>
+			<version>1.7.7</version>
+		</dependency>
+		<dependency>
+			<groupId>org.slf4j</groupId>
+			<artifactId>slf4j-simple</artifactId>
+			<version>1.7.7</version>
+		</dependency>
+		<dependency>
+			<groupId>junit</groupId>
+			<artifactId>junit</artifactId>
+			<version>4.11</version>
+		</dependency>
+		<dependency>
+			<groupId>com.googlecode.efficient-java-matrix-library</groupId>
+			<artifactId>ejml</artifactId>
+			<version>0.24</version>
+		</dependency>
 		<dependency>
 			<groupId>org.apache.commons</groupId>
 			<artifactId>commons-math3</artifactId>