diff --git a/dnet-pace-core/pom.xml b/dnet-pace-core/pom.xml
index 51958c50c..d0b4a150a 100644
--- a/dnet-pace-core/pom.xml
+++ b/dnet-pace-core/pom.xml
@@ -6,7 +6,7 @@
 	<parent>
 		<groupId>eu.dnetlib</groupId>
 		<artifactId>dnet-dedup</artifactId>
-		<version>3.0.1-SNAPSHOT</version>
+		<version>3.0.3-SNAPSHOT</version>
         <relativePath>../pom.xml</relativePath>
 	</parent>
 
@@ -59,10 +59,17 @@
 			<groupId>org.reflections</groupId>
 			<artifactId>reflections</artifactId>
 		</dependency>
+
 		<dependency>
-			<groupId>org.apache.spark</groupId>
-			<artifactId>spark-core_2.11</artifactId>
+			<groupId>com.fasterxml.jackson.core</groupId>
+			<artifactId>jackson-databind</artifactId>
 		</dependency>
+		<dependency>
+			<groupId>org.codehaus.jackson</groupId>
+			<artifactId>jackson-mapper-asl</artifactId>
+		</dependency>
+
+
 	</dependencies>
 
 </project>
diff --git a/dnet-pace-core/src/main/java/eu/dnetlib/pace/common/AbstractPaceFunctions.java b/dnet-pace-core/src/main/java/eu/dnetlib/pace/common/AbstractPaceFunctions.java
index dde321816..3647b32eb 100644
--- a/dnet-pace-core/src/main/java/eu/dnetlib/pace/common/AbstractPaceFunctions.java
+++ b/dnet-pace-core/src/main/java/eu/dnetlib/pace/common/AbstractPaceFunctions.java
@@ -1,26 +1,22 @@
 package eu.dnetlib.pace.common;
 
-import java.text.Normalizer;
-import java.util.*;
-import java.util.regex.Matcher;
-import java.util.regex.Pattern;
-
-import com.google.common.collect.Maps;
-import eu.dnetlib.pace.distance.algo.JaroWinklerNormalizedName;
-import org.apache.commons.collections.CollectionUtils;
-import org.apache.commons.io.IOUtils;
-import org.apache.commons.lang.StringUtils;
-
 import com.google.common.base.Joiner;
 import com.google.common.collect.Iterables;
 import com.google.common.collect.Lists;
 import com.google.common.collect.Sets;
-
 import eu.dnetlib.pace.clustering.NGramUtils;
+import eu.dnetlib.pace.distance.algo.JaroWinklerNormalizedName;
 import eu.dnetlib.pace.model.Field;
 import eu.dnetlib.pace.model.FieldList;
 import eu.dnetlib.pace.model.FieldListImpl;
-import org.apache.spark.util.CollectionsUtils;
+import org.apache.commons.collections.CollectionUtils;
+import org.apache.commons.io.IOUtils;
+import org.apache.commons.lang.StringUtils;
+
+import java.text.Normalizer;
+import java.util.*;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
 
 /**
  * Set of common functions