code: def serializePaper(self):
          
          pid = tethnedao.getMaxPaperID();
          papers_details = []
  
          for paper in self.corpus:
              pid = pid + 1
              paper_key = getattr(paper, Serialize.paper_source_map[self.source])
              self.paperIdMap[paper_key] = pid
              paper_data = {
                  "model": "django-tethne.paper",
                  "pk": self.paperIdMap[paper_key],
                  "fields": {
                      "paper_id": paper_key,
                      "corpus":self.corpus_id,
                      "pub_date": getattr(paper, 'date', ''),
                      "volume": getattr(paper, 'volume', ''),
                      "title": getattr(paper, 'title', ''),
                      "abstract": getattr(paper, 'abstract', ''),
                  }
              }
              papers_details.append(paper_data)
          return papers_details
docs: This method creates a fixture for the "django-tethne_paper" model.
  
          Returns
          -------
          paper_details in JSON format, which can written to a file.