code: def cable_page_by_id(reference_id):
      
      global _CABLEID2MONTH
      def wikileaks_id(reference_id):
          if reference_id in consts.INVALID_CABLE_IDS.values():
              for k, v in consts.INVALID_CABLE_IDS.iteritems():
                  if v == reference_id:
                      return k
          return reference_id
  
      def wikileaks_url(wl_id):
          m = _CABLEID2MONTH.get(wl_id)
          if m is None:
              return None
          y = wl_id[:2]
          y = u'19' + y if int(y) > 10 else u'20' + y
          return u'https://wikileaks.org/cable/%s/%s/%s' % (y, m.zfill(2), wl_id)
  
      if _CABLEID2MONTH is None:
          with gzip.open(os.path.join(os.path.dirname(__file__), 'cable2month.csv.gz'), 'r') as f:
              reader = csv.reader(f)
              _CABLEID2MONTH = dict(reader)
      wl_id = wikileaks_id(reference_id)
      wl_url = wikileaks_url(wl_id)
      if wl_url is None:
          # The cable reference is not known, try to consult Cablegatesearch.
          html = _fetch_url(_CGSN_BASE + wl_id)
          m = _CGSN_WL_SOURCE_SEARCH(html)
          wl_url = m.group(1) if m else None
      if wl_url is None:
          return None
      return _fetch_url(wl_url)
docs: \
      Experimental: Returns the HTML page of the cable identified by `reference_id`.
  
      >>> cable_page_by_id('09BERLIN1167') is not None
      True
      >>> cable_page_by_id('22BERLIN1167') is None
      True
      >>> cable_page_by_id('09MOSCOW3010') is not None
      True
      >>> cable_page_by_id('10MADRID87') is not None
      True
      >>> cable_page_by_id('10MUSCAT103') is not None
      True