@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}, 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://archive.numdam.org/item/CTGDC_1982__23_1_47_0/} }