diff --git a/dhp-common/src/main/java/eu/dnetlib/dhp/common/collection/DecompressTarGz.java b/dhp-common/src/main/java/eu/dnetlib/dhp/common/collection/DecompressTarGz.java
new file mode 100644
index 000000000..8bcf14ba4
--- /dev/null
+++ b/dhp-common/src/main/java/eu/dnetlib/dhp/common/collection/DecompressTarGz.java
@@ -0,0 +1,40 @@
+
+package eu.dnetlib.dhp.common.collection;
+
+import java.io.BufferedOutputStream;
+import java.io.IOException;
+import java.util.zip.GZIPOutputStream;
+
+import org.apache.commons.compress.archivers.tar.TarArchiveEntry;
+import org.apache.commons.compress.archivers.tar.TarArchiveInputStream;
+import org.apache.commons.compress.compressors.gzip.GzipCompressorInputStream;
+import org.apache.commons.io.IOUtils;
+import org.apache.hadoop.fs.FSDataInputStream;
+import org.apache.hadoop.fs.FSDataOutputStream;
+import org.apache.hadoop.fs.FileSystem;
+import org.apache.hadoop.fs.Path;
+
+public class DecompressTarGz {
+
+	public static void doExtract(FileSystem fs, String outputPath, String tarGzPath) throws IOException {
+
+		FSDataInputStream inputFileStream = fs.open(new Path(tarGzPath));
+		try (TarArchiveInputStream tais = new TarArchiveInputStream(
+			new GzipCompressorInputStream(inputFileStream))) {
+			TarArchiveEntry entry = null;
+			while ((entry = tais.getNextTarEntry()) != null) {
+				if (!entry.isDirectory()) {
+					try (
+						FSDataOutputStream out = fs
+							.create(new Path(outputPath.concat(entry.getName()).concat(".gz")));
+						GZIPOutputStream gzipOs = new GZIPOutputStream(new BufferedOutputStream(out))) {
+
+						IOUtils.copy(tais, gzipOs);
+
+					}
+
+				}
+			}
+		}
+	}
+}
diff --git a/dhp-workflows/dhp-doiboost/src/main/java/eu/dnetlib/doiboost/crossref/ExtractCrossrefRecords.java b/dhp-workflows/dhp-doiboost/src/main/java/eu/dnetlib/doiboost/crossref/ExtractCrossrefRecords.java
index d1861ff0a..6060b619e 100644
--- a/dhp-workflows/dhp-doiboost/src/main/java/eu/dnetlib/doiboost/crossref/ExtractCrossrefRecords.java
+++ b/dhp-workflows/dhp-doiboost/src/main/java/eu/dnetlib/doiboost/crossref/ExtractCrossrefRecords.java
@@ -1,19 +1,13 @@
 
 package eu.dnetlib.doiboost.crossref;
 
-import java.io.BufferedOutputStream;
-import java.net.URI;
-import java.util.zip.GZIPOutputStream;
+import static eu.dnetlib.dhp.common.collection.DecompressTarGz.doExtract;
+
+import java.net.URI;
 
-import org.apache.commons.compress.archivers.tar.TarArchiveEntry;
-import org.apache.commons.compress.archivers.tar.TarArchiveInputStream;
-import org.apache.commons.compress.compressors.gzip.GzipCompressorInputStream;
 import org.apache.commons.io.IOUtils;
 import org.apache.hadoop.conf.Configuration;
-import org.apache.hadoop.fs.FSDataInputStream;
-import org.apache.hadoop.fs.FSDataOutputStream;
 import org.apache.hadoop.fs.FileSystem;
-import org.apache.hadoop.fs.Path;
 import org.mortbay.log.Log;
 
 import eu.dnetlib.dhp.application.ArgumentApplicationParser;
@@ -33,31 +27,16 @@ public class ExtractCrossrefRecords {
 		final String outputPath = parser.get("outputPath");
 		final String crossrefFileNameTarGz = parser.get("crossrefFileNameTarGz");
 
-		Path hdfsreadpath = new Path(workingPath.concat("/").concat(crossrefFileNameTarGz));
 		Configuration conf = new Configuration();
 		conf.set("fs.defaultFS", workingPath);
 		conf.set("fs.hdfs.impl", org.apache.hadoop.hdfs.DistributedFileSystem.class.getName());
 		conf.set("fs.file.impl", org.apache.hadoop.fs.LocalFileSystem.class.getName());
 		FileSystem fs = FileSystem.get(URI.create(workingPath), conf);
-		FSDataInputStream crossrefFileStream = fs.open(hdfsreadpath);
-		try (TarArchiveInputStream tais = new TarArchiveInputStream(
-			new GzipCompressorInputStream(crossrefFileStream))) {
-			TarArchiveEntry entry = null;
-			while ((entry = tais.getNextTarEntry()) != null) {
-				if (!entry.isDirectory()) {
-					try (
-						FSDataOutputStream out = fs
-							.create(new Path(outputPath.concat(entry.getName()).concat(".gz")));
-						GZIPOutputStream gzipOs = new GZIPOutputStream(new BufferedOutputStream(out))) {
 
-						IOUtils.copy(tais, gzipOs);
+		doExtract(fs, outputPath, workingPath.concat("/").concat(crossrefFileNameTarGz));
 
-					}
-
-				}
-			}
-		}
 		Log.info("Crossref dump reading completed");
 
 	}
+
 }