code: def getReffs(self, textId, level=1, subreference=None):
          
          return self.get_or(
              self.__cache_key_reffs__(textId, level, subreference),
              super(ProtoNautilusCtsResolver, self).getReffs, textId, level, subreference
          )
docs: Retrieve the siblings of a textual node
  
          :param textId: PrototypeText Identifier
          :type textId: str
          :param level: Depth for retrieval
          :type level: int
          :param subreference: Passage Reference
          :type subreference: str
          :return: List of references
          :rtype: [str]