code: def is_published(self):
          
          citeable = 'publication_info' in self.record and \
              is_citeable(self.record['publication_info'])
  
          submitted = 'dois' in self.record and any(
              'journal_title' in el for el in
              force_list(self.record.get('publication_info'))
          )
  
          return citeable or submitted
docs: Return True if a record is published.
  
          We say that a record is published if it is citeable, which means that
          it has enough information in a ``publication_info``, or if we know its
          DOI and a ``journal_title``, which means it is in press.
  
          Returns:
              bool: whether the record is published.
  
          Examples:
              >>> record = {
              ...     'dois': [
              ...         {'value': '10.1016/0029-5582(61)90469-2'},
              ...     ],
              ...     'publication_info': [
              ...         {'journal_title': 'Nucl.Phys.'},
              ...     ],
              ... }
              >>> LiteratureReader(record).is_published
              True