code: def getLinkedRequests(self):
          rc = api.get_tool("reference_catalog")
          refs = rc.getBackReferences(self, "AnalysisRequestAttachment")
          ars = map(lambda ref: api.get_object_by_uid(ref.sourceUID, None), refs)
          ars = filter(None, ars)
          return sorted(ars, key=api.get_path, reverse=True)