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)