code: def _loadSources(self):
          
          self.confstems = {}
          self.sourceDict = newtrigdict.Trigdict()
          for fName in self.authorityFiles:
              self._loadOneSource(fName)
          # We want to allow naked bibstems in references, too
          for stem in self.sourceDict.values():
              cleanStem = stem.replace(".", "").upper()
              self._addPub(stem, cleanStem)
docs: creates a trigdict and populates it with data from self.autorityFiles