diff --git a/server/src/routes/works.routes.js b/server/src/routes/works.routes.js
index 937ef9ad..8492f14c 100644
--- a/server/src/routes/works.routes.js
+++ b/server/src/routes/works.routes.js
@@ -1,7 +1,6 @@
 import express from 'express';
 
-import { groupByAffiliations } from '../utils/utils';
-import { deduplicateWorks, getFosmWorks, getOpenAlexPublications } from '../utils/works';
+import { deduplicateWorks, getFosmWorks, getOpenAlexPublications, groupByAffiliations } from '../utils/works';
 
 const router = new express.Router();
 
@@ -21,43 +20,60 @@ router.route('/works')
           getFosmWorks({ options: { ...options, filter: { field: 'genre', value: 'dataset' } }, index: process.env.VITE_FOSM_DATASETS_INDEX }),
         ]);
         console.timeEnd(`0. Requests ${options.affiliations}`);
-        console.time(`1. Filter ${options.affiliations}`);
-        const data = {};
-        data.publications = {
-          results: [
-            ...responses[0].results.filter((result) => result.genre_raw !== 'dataset'),
-            ...responses[1].results,
-          ],
-        };
-        data.datasets = {
-          results: [
-            ...responses[0].results.filter((result) => result.genre_raw === 'dataset'),
-            ...responses[2].results,
-          ],
-        };
-        console.timeEnd(`1. Filter ${options.affiliations}`);
+        console.time(`1. Concat ${options.affiliations}`);
+        const works = [
+          ...responses[0],
+          ...responses[1],
+          ...responses[2],
+        ];
+        console.timeEnd(`1. Concat ${options.affiliations}`);
         console.time(`2. Dedup ${options.affiliations}`);
         // Deduplicate publications by ids
-        data.publications.results = deduplicateWorks(data.publications.results);
+        const deduplicatedWorks = deduplicateWorks(works);
         console.timeEnd(`2. Dedup ${options.affiliations}`);
+        // Goup by affiliations
+        console.time(`3. GroupBy ${options.affiliations}`);
+        const uniqueAffiliations = groupByAffiliations({ options, works: deduplicatedWorks });
+        console.timeEnd(`3. GroupBy ${options.affiliations}`);
+        // Sort between publications and datasets
+        console.time(`4. Sort ${options.affiliations}`);
+        const publications = [];
+        const datasets = [];
+        deduplicatedWorks.forEach((deduplicatedWork) => {
+          if (
+            (deduplicatedWork.datasource.includes('fosm') && deduplicatedWork.genre_raw !== 'dataset')
+            || (deduplicatedWork.datasource.includes('openalex') && deduplicatedWork.type !== 'dataset')
+          ) {
+            publications.push(deduplicatedWork);
+          } else if (
+            (deduplicatedWork.datasource.includes('fosm') && deduplicatedWork.genre_raw === 'dataset')
+            || (deduplicatedWork.datasource.includes('openalex') && deduplicatedWork.type === 'dataset')
+          ) {
+            datasets.push(deduplicatedWork);
+          } else {
+            console.log(`Work not sort : ${JSON.stringify(deduplicatedWork)}`);
+          }
+        });
+        console.timeEnd(`4. Sort ${options.affiliations}`);
         // Compute distinct types & years for facet
-        console.time(`3. Facet ${options.affiliations}`);
-        data.publications.years = [...new Set(
-          data.publications.results.filter((publication) => !!publication?.year).map((publication) => Number(publication.year)),
+        console.time(`5. Facet ${options.affiliations}`);
+        const publicationsYears = [...new Set(
+          publications.filter((publication) => !!publication?.year).map((publication) => Number(publication.year)),
         )].sort((a, b) => b - a);
-        data.datasets.years = [...new Set(
-          data.datasets.results.filter((dataset) => !!dataset?.year).map((dataset) => Number(dataset.year)),
+        const datasetsYears = [...new Set(
+          datasets.filter((dataset) => !!dataset?.year).map((dataset) => Number(dataset.year)),
         )].sort((a, b) => b - a);
-        data.publications.types = [...new Set(data.publications.results.map((publication) => publication?.type))];
-        data.datasets.types = [...new Set(data.datasets.results.map((dataset) => dataset?.type))];
-        console.timeEnd(`3. Facet ${options.affiliations}`);
-        // Goup by affiliations
-        console.time(`4. GroupBy ${options.affiliations}`);
-        data.affiliations = groupByAffiliations({ ...data, options });
-        console.timeEnd(`4. GroupBy ${options.affiliations}`);
-        console.time(`5. Serialization ${options.affiliations}`);
-        res.status(200).json(data);
-        console.timeEnd(`5. Serialization ${options.affiliations}`);
+        const publicationsTypes = [...new Set(publications.map((publication) => publication?.type))];
+        const datasetsTypes = [...new Set(datasets.map((dataset) => dataset?.type))];
+        console.timeEnd(`5. Facet ${options.affiliations}`);
+        // Build and serialize response
+        console.time(`6. Serialization ${options.affiliations}`);
+        res.status(200).json({
+          affiliations: uniqueAffiliations,
+          datasets: { results: datasets, types: datasetsTypes, years: datasetsYears },
+          publications: { results: publications, types: publicationsTypes, years: publicationsYears },
+        });
+        console.timeEnd(`6. Serialization ${options.affiliations}`);
       }
     } catch (err) {
       console.error(err);
diff --git a/server/src/utils/utils.js b/server/src/utils/utils.js
index f02397de..f7827e95 100644
--- a/server/src/utils/utils.js
+++ b/server/src/utils/utils.js
@@ -39,39 +39,9 @@ const normalizedName = (name) => name
   .replace(/\s+/g, ' ')
   .trim();
 
-const groupByAffiliations = ({ datasets, options, publications }) => {
-  const regexp = getRegexpFromOptions(options);
-  // Compute distinct affiliations of the undecided works
-  let allAffiliationsTmp = {};
-  [...datasets.results, ...publications.results].forEach((work) => {
-    (work?.affiliations ?? [])
-      .forEach((affiliation) => {
-        const normalizedAffiliationName = normalizedName(affiliation);
-        if (!allAffiliationsTmp?.[normalizedAffiliationName]) {
-          // Check matches in affiliation name
-          let matches = affiliation?.match(regexp) ?? [];
-          // Normalize matched strings
-          matches = matches.map((match) => normalizedName(match));
-          // Filter matches as unique
-          matches = [...new Set(matches)];
-          allAffiliationsTmp[normalizedAffiliationName] = {
-            matches: matches.length,
-            name: affiliation,
-            nameHtml: affiliation.replace(regexp, '<b>$&</b>'),
-            works: [],
-          };
-        }
-        allAffiliationsTmp[normalizedAffiliationName].works.push(work.id);
-      });
-  });
-
-  allAffiliationsTmp = Object.values(allAffiliationsTmp)
-    .map((affiliation, index) => ({ ...affiliation, id: index.toString(), works: [...new Set(affiliation.works)], worksNumber: [...new Set(affiliation.works)].length }));
-  return allAffiliationsTmp;
-};
-
 export {
   cleanId,
-  groupByAffiliations,
+  getRegexpFromOptions,
+  normalizedName,
   range,
 };
diff --git a/server/src/utils/works.js b/server/src/utils/works.js
index 88805af0..d22031fd 100644
--- a/server/src/utils/works.js
+++ b/server/src/utils/works.js
@@ -1,4 +1,4 @@
-import { cleanId, range } from './utils';
+import { cleanId, getRegexpFromOptions, normalizedName, range } from './utils';
 
 const VITE_OPENALEX_MAX_PAGE = Math.floor(process.env.VITE_OPENALEX_SIZE / process.env.VITE_OPENALEX_PER_PAGE);
 
@@ -114,10 +114,7 @@ const getFosmWorks = async ({ options }) => {
   const years = range(startYear, endYear);
   const promises = years.map((year) => getFosmWorksByYear({ options: { ...options, year } }));
   const allResults = await Promise.all(promises);
-  return ({
-    datasource: 'fosm',
-    results: allResults.flat(),
-  });
+  return allResults.flat();
 };
 
 const getTypeFromOpenAlex = (type) => {
@@ -210,14 +207,43 @@ const getOpenAlexPublications = async ({ options }) => {
   const years = range(startYear, endYear);
   const promises = years.map((year) => getOpenAlexPublicationsByYear({ ...options, year }));
   const allResults = await Promise.all(promises);
-  return ({
-    datasource: 'openalex',
-    results: allResults.flat(),
+  return allResults.flat();
+};
+
+const groupByAffiliations = ({ options, works }) => {
+  const regexp = getRegexpFromOptions(options);
+  // Compute distinct affiliations of works
+  let allAffiliationsTmp = {};
+  works.forEach((work) => {
+    (work?.affiliations ?? [])
+      .forEach((affiliation) => {
+        const normalizedAffiliationName = normalizedName(affiliation);
+        if (!allAffiliationsTmp?.[normalizedAffiliationName]) {
+          // Check matches in affiliation name
+          let matches = affiliation?.match(regexp) ?? [];
+          // Normalize matched strings
+          matches = matches.map((match) => normalizedName(match));
+          // Filter matches as unique
+          matches = [...new Set(matches)];
+          allAffiliationsTmp[normalizedAffiliationName] = {
+            matches: matches.length,
+            name: affiliation,
+            nameHtml: affiliation.replace(regexp, '<b>$&</b>'),
+            works: [],
+          };
+        }
+        allAffiliationsTmp[normalizedAffiliationName].works.push(work.id);
+      });
   });
+
+  allAffiliationsTmp = Object.values(allAffiliationsTmp)
+    .map((affiliation, index) => ({ ...affiliation, id: index.toString(), works: [...new Set(affiliation.works)], worksNumber: [...new Set(affiliation.works)].length }));
+  return allAffiliationsTmp;
 };
 
 export {
   deduplicateWorks,
   getFosmWorks,
   getOpenAlexPublications,
+  groupByAffiliations,
 };