String s1 = ref1.getSource();
String s2 = ref2.getSource();
boolean s1Primary = DBRefSource.isPrimarySource(s1);
boolean s2Primary = DBRefSource.isPrimarySource(s2);
String s1 = ref1.getSource();
String s2 = ref2.getSource();
boolean s1Primary = DBRefSource.isPrimarySource(s1);
boolean s2Primary = DBRefSource.isPrimarySource(s2);