@article{CTGDC_1996__37_2_82_0,
     author = {Ageron, Pierre},
     title = {Effective taxonomies and crossed taxonomies},
     journal = {Cahiers de Topologie et G\'eom\'etrie Diff\'erentielle Cat\'egoriques},
     pages = {82--90},
     publisher = {Dunod \'editeur, publi\'e avec le concours du CNRS},
     volume = {37},
     number = {2},
     year = {1996},
     mrnumber = {1394504},
     zbl = {0859.18002},
     language = {en},
     url = {http://www.numdam.org/item/CTGDC_1996__37_2_82_0/}
}