code: def mangle_volume(citation_elements):
      
      volume_re = re.compile(ur"(\d+)([A-Z])", re.U | re.I)
      for el in citation_elements:
          if el['type'] == 'JOURNAL':
              matches = volume_re.match(el['volume'])
              if matches:
                  el['volume'] = matches.group(2) + matches.group(1)
  
      return citation_elements
docs: Make sure the volume letter is before the volume number
  
      e.g. transforms 100B to B100