diff --git a/src/main/java/eu/openaire/api/dto/request/ResearchProductsRequest.java b/src/main/java/eu/openaire/api/dto/request/ResearchProductsRequest.java
index 71bb411..3feaf56 100644
--- a/src/main/java/eu/openaire/api/dto/request/ResearchProductsRequest.java
+++ b/src/main/java/eu/openaire/api/dto/request/ResearchProductsRequest.java
@@ -67,18 +67,17 @@ public class ResearchProductsRequest {
 //	@ValidBestAccessRightLabel(message = "bestAccessRightLabel should be one of 'OPEN SOURCE', 'OPEN', 'EMBARGO', 'RESTRICTED', 'CLOSED', 'UNKNOWN'")
 	private String[] bestOpenAccessRightLabel;
 
-//	@Parameter(description = "Citation-based indicator that reflects the overall impact of a research product", array = @ArraySchema(schema = @Schema(type = "string", allowableValues = {"c1", "c2", "c3", "c4", "c5"})))
-//	private String[] influenceIndicator;
-//
-//	@Parameter(description = "Citation-based indicator that reflects current impact or attention of a research product", array = @ArraySchema(schema = @Schema(type = "string", allowableValues = {"c1", "c2", "c3", "c4", "c5"})))
-//	private String[] popularityIndicator;
-//
-//	@Parameter(description = "Citation-based indicator that reflects the initial momentum of a research product directly after its publication", array = @ArraySchema(schema = @Schema(type = "string", allowableValues = {"c1", "c2", "c3", "c4", "c5"})))
-//	private String[] impulseIndicator;
-//
-//	@Parameter(description = "The type of the research product", array = @ArraySchema(schema = @Schema(type = "string", allowableValues = {"c1", "c2", "c3", "c4", "c5"})))
-//	private String[] citationCountIndicator;
-//
+	@Parameter(description = "Citation-based indicator that reflects the overall impact of a research product; please choose a class among 'C1', 'C2', 'C3', 'C4', 'C5' for  top 0.01%, top 0.1%, top 1%, top 10%, and average in terms of influence respectively", array = @ArraySchema(schema = @Schema(type = "string", allowableValues = {"C1", "C2", "C3", "C4", "C5"})))
+	private String[] influenceClass;
+
+	@Parameter(description = "Citation-based indicator that reflects current impact or attention of a research product; please choose a class among 'C1', 'C2', 'C3', 'C4', 'C5' for  top 0.01%, top 0.1%, top 1%, top 10%, and average in terms of popularity respectively", array = @ArraySchema(schema = @Schema(type = "string", allowableValues = {"C1", "C2", "C3", "C4", "C5"})))
+	private String[] popularityClass;
+
+	@Parameter(description = "Citation-based indicator that reflects the initial momentum of a research product directly after its publication; please choose a class among 'C1', 'C2', 'C3', 'C4', 'C5' for  top 0.01%, top 0.1%, top 1%, top 10%, and in terms of average impulse respectively", array = @ArraySchema(schema = @Schema(type = "string", allowableValues = {"C1", "C2", "C3", "C4", "C5"})))
+	private String[] impulseClass;
+
+	@Parameter(description = "Citation-based indicator that reflects the overall impact of a research product by summing all its citations; please choose a class among 'C1', 'C2', 'C3', 'C4', 'C5' for  top 0.01%, top 0.1%, top 1%, top 10%, and average in terms of citation count respectively", array = @ArraySchema(schema = @Schema(type = "string", allowableValues = {"C1", "C2", "C3", "C4", "C5"})))
+	private String[] citationCountClass;
 
 	// publication related filters
 //	@Parameter(description = "Retrieves publications classified with the respective Sustainable Development Goal number (for further information check <a href='https://sdgs.un.org/goals' target='_blank'>here</a>); the values for SDGs are numbers from 1 to 17 `[Only for publications]`", array = @ArraySchema(schema = @Schema(type = "integer")))
diff --git a/src/main/java/eu/openaire/api/mappers/query/ResearchProductsRequestMapper.java b/src/main/java/eu/openaire/api/mappers/query/ResearchProductsRequestMapper.java
index e516e50..9d3f71a 100644
--- a/src/main/java/eu/openaire/api/mappers/query/ResearchProductsRequestMapper.java
+++ b/src/main/java/eu/openaire/api/mappers/query/ResearchProductsRequestMapper.java
@@ -57,6 +57,10 @@ public interface ResearchProductsRequestMapper {
 				Map.entry("subjects", "resultsubject:(%s)"),
 				Map.entry("publisher", "resultpublisher:(%s)"),
 				Map.entry("publicationDate", "resultdateofacceptance:[%s TO %s]"),
+				Map.entry("influence", "influence_class:(%s)"),
+				Map.entry("popularity", "popularity_class:(%s)"),
+				Map.entry("impulse", "impulse_class:(%s)"),
+				Map.entry("citationCount", "citation_count_class:(%s)"),
 
 				// related entity fields
 				Map.entry("relOrganizationId", "relorganizationid:(%s)"),
@@ -180,6 +184,22 @@ public interface ResearchProductsRequestMapper {
 			fqList.add(String.format(solrFieldMapping.get("publisher"), Utils.escapeAndJoin(src.getPublisher(), "OR", false)));
 		}
 
+		if (!Utils.isNullOrEmpty(src.getInfluenceClass())) {
+			fqList.add(String.format(solrFieldMapping.get("influence"), Utils.escapeAndJoin(src.getInfluenceClass(), "OR", false)));
+		}
+
+		if (!Utils.isNullOrEmpty(src.getPopularityClass())) {
+			fqList.add(String.format(solrFieldMapping.get("popularity"), Utils.escapeAndJoin(src.getPopularityClass(), "OR", false)));
+		}
+
+		if (!Utils.isNullOrEmpty(src.getImpulseClass())) {
+			fqList.add(String.format(solrFieldMapping.get("impulse"), Utils.escapeAndJoin(src.getImpulseClass(), "OR", false)));
+		}
+
+		if (!Utils.isNullOrEmpty(src.getCitationCountClass())) {
+			fqList.add(String.format(solrFieldMapping.get("citationCount"), Utils.escapeAndJoin(src.getCitationCountClass(), "OR", false)));
+		}
+
 
 		// related entity fields
 		if (!Utils.isNullOrEmpty(src.getRelCommunityId())) {