@Override
 public int hashCode() {
   final int prime = 31;
   int result = 1;
   result = prime * result + ((creditName == null) ? 0 : creditName.hashCode());
   result = prime * result + ((familyName == null) ? 0 : familyName.hashCode());
   result = prime * result + ((givenNames == null) ? 0 : givenNames.hashCode());
   result = prime * result + ((otherNames == null) ? 0 : otherNames.hashCode());
   return result;
 }