@Override
 public ReferenceProperty findReferenceType(AnnotatedMember member) {
   JsonManagedReference ref1 = _findAnnotation(member, JsonManagedReference.class);
   if (ref1 != null) {
     return AnnotationIntrospector.ReferenceProperty.managed(ref1.value());
   }
   JsonBackReference ref2 = _findAnnotation(member, JsonBackReference.class);
   if (ref2 != null) {
     return AnnotationIntrospector.ReferenceProperty.back(ref2.value());
   }
   return null;
 }