diff --git a/dhp-workflows/dhp-doiboost/src/main/scala/eu/dnetlib/doiboost/SparkGenerateDoiBoost.scala b/dhp-workflows/dhp-doiboost/src/main/scala/eu/dnetlib/doiboost/SparkGenerateDoiBoost.scala
index 9323c994cf..2cbd530979 100644
--- a/dhp-workflows/dhp-doiboost/src/main/scala/eu/dnetlib/doiboost/SparkGenerateDoiBoost.scala
+++ b/dhp-workflows/dhp-doiboost/src/main/scala/eu/dnetlib/doiboost/SparkGenerateDoiBoost.scala
@@ -59,52 +59,6 @@ object SparkGenerateDoiBoost {
     val workingDirPath = parser.get("workingPath")
     val openaireOrganizationPath = parser.get("openaireOrganizationPath")
 
-    val crossrefAggregator = new Aggregator[(String, Publication), Publication, Publication] with Serializable {
-      override def zero: Publication = new Publication
-
-      override def reduce(b: Publication, a: (String, Publication)): Publication = {
-
-        if (b == null) {
-          if (a != null && a._2 != null) {
-            a._2.setId(a._1)
-            return a._2
-          }
-        } else {
-          if (a != null && a._2 != null) {
-            b.mergeFrom(a._2)
-            b.setId(a._1)
-            val authors = AuthorMerger.mergeAuthor(b.getAuthor, a._2.getAuthor)
-            b.setAuthor(authors)
-            return b
-          }
-        }
-        new Publication
-      }
-
-      override def merge(b1: Publication, b2: Publication): Publication = {
-        if (b1 == null) {
-          if (b2 != null)
-            return b2
-        } else {
-          if (b2 != null) {
-            b1.mergeFrom(b2)
-            val authors = AuthorMerger.mergeAuthor(b1.getAuthor, b2.getAuthor)
-            b1.setAuthor(authors)
-            if (b2.getId != null && b2.getId.nonEmpty)
-              b1.setId(b2.getId)
-            return b1
-          }
-        }
-        new Publication
-      }
-
-      override def finish(reduction: Publication): Publication = reduction
-
-      override def bufferEncoder: Encoder[Publication] = Encoders.kryo[Publication]
-
-      override def outputEncoder: Encoder[Publication] = Encoders.kryo[Publication]
-    }
-
     implicit val mapEncoderPub: Encoder[Publication] = Encoders.kryo[Publication]
     implicit val mapEncoderOrg: Encoder[Organization] = Encoders.kryo[Organization]
     implicit val mapEncoderDataset: Encoder[OafDataset] = Encoders.kryo[OafDataset]
@@ -175,8 +129,33 @@ object SparkGenerateDoiBoost {
       .map(DoiBoostMappingUtil.fixPublication)
       .map(p => (p.getId, p))
       .groupByKey(_._1)
-      .agg(crossrefAggregator.toColumn)
-      .map(p => p._2)
+      .reduceGroups((left, right) => {
+        //Check left is not  null
+        if (left != null && left._1 != null) {
+          //If right is null then return left
+          if (right == null || right._2 == null)
+            left
+          else {
+            // Here Left and Right are not null
+            // So we have to merge
+            val b1 = left._2
+            val b2 = right._2
+            b1.mergeFrom(b2)
+            b1.mergeOAFDataInfo(b2)
+            val authors = AuthorMerger.mergeAuthor(b1.getAuthor, b2.getAuthor)
+            b1.setAuthor(authors)
+            if (b2.getId != null && b2.getId.nonEmpty)
+              b1.setId(b2.getId)
+            //Return publication Merged
+            (b1.getId, b1)
+          }
+        } else {
+          // Left is Null so we return right
+          right
+        }
+      })
+      .filter(s => s != null && s._2 != null)
+      .map(s => s._2._2)
       .write
       .mode(SaveMode.Overwrite)
       .save(s"$workingDirPath/doiBoostPublicationFiltered")