code: def reffs(self):
          
          if not self.citation.is_set():
              self.getLabel()
          return [
              reff for reffs in [self.getValidReff(level=i) for i in range(1, len(self.citation) + 1)] for reff in reffs
          ]
docs: Get all valid reffs for every part of the CtsText
  
          :rtype: MyCapytain.resources.texts.tei.XmlCtsCitation