diff --git a/cds_dojson/marc21/fields/base.py b/cds_dojson/marc21/fields/base.py
index 9a5d27d4..be1625a0 100644
--- a/cds_dojson/marc21/fields/base.py
+++ b/cds_dojson/marc21/fields/base.py
@@ -20,10 +20,11 @@
 
 from __future__ import absolute_import, print_function
 
-from dojson.utils import IgnoreKey, filter_values, for_each_value, \
-    force_list, ignore_value
+from dojson.utils import (IgnoreKey, filter_values, for_each_value, force_list,
+                          ignore_value)
 
 from ..models.base import model
+from .utils import build_contributor, build_contributor_from_508
 
 
 @model.over('recid', '^001')
diff --git a/cds_dojson/marc21/fields/utils.py b/cds_dojson/marc21/fields/utils.py
index 11a26973..d3a462d1 100644
--- a/cds_dojson/marc21/fields/utils.py
+++ b/cds_dojson/marc21/fields/utils.py
@@ -350,7 +350,7 @@ def _extract_json_ids(info, provenence='source'):
         'AUTHOR|(CDS)': 'CDS',
         'AUTHOR|(SzGeCERN)': 'CERN'
     }
-    regex = re.compile(r'(AUTHOR\|\((CDS|INSPIRE|SzGeCERN)\))(.*)')
+    regex = re.compile(r'((AUTHOR\|\((CDS|INSPIRE)\))|(\(SzGeCERN\)))(.*)')
     ids = []
     author_ids = force_list(info.get('0', ''))
     for author_id in author_ids:
diff --git a/cds_dojson/marc21/utils.py b/cds_dojson/marc21/utils.py
index 0a9a127c..9810ddb3 100644
--- a/cds_dojson/marc21/utils.py
+++ b/cds_dojson/marc21/utils.py
@@ -18,7 +18,7 @@
 # 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
 """Utilities for converting MARC21."""
 
-from dojson.contrib.marc21.utils import MARC21_DTD
+from dojson.contrib.marc21.utils import MARC21_DTD, split_stream
 from lxml import etree
 from six import StringIO, binary_type, text_type
 
diff --git a/tests/test_utils.py b/tests/test_utils.py
index 0e93673d..5082fd5c 100644
--- a/tests/test_utils.py
+++ b/tests/test_utils.py
@@ -21,7 +21,6 @@
 
 import json
 import os
-
 import pytest
 from dojson.utils import filter_values