@article{19987,
      note = {Na s. red.: WIPO 1993. Reprinted 1997.},
      url = {http://tind.wipo.int/record/19987},
      title = {Strasbourg agreement concerning the international patent  classification of March 24, 1971, as amended on September  28, 1979.},
      recid = {19987},
      pages = {19 pages ;},
}