docs: def getReffs(self, level=1, subreference=None) -> CtsReferenceSet:
          """ Reference available at a given level
  
          :param level: Depth required. If not set, should retrieve first encountered level (1 based). 0 retrieves inside
              a range
          :param subreference: Subreference (optional)
          :returns: List of levels
          """
          level += self.depth
          if not subreference:
              subreference = self.reference
          return self.textObject.getValidReff(level, reference=subreference)