@article{CTGDC_1982__23_1_47_0,
     author = {M\"obus, Axel},
     title = {Syntactical theory of functors},
     journal = {Cahiers de Topologie et G\'eom\'etrie Diff\'erentielle Cat\'egoriques},
     pages = {47--53},
     publisher = {Dunod \'editeur, publi\'e avec le concours du CNRS},
     volume = {23},
     number = {1},
     year = {1982},
     mrnumber = {648795},
     zbl = {0476.18001},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CTGDC_1982__23_1_47_0/}
}