@article{CTGDC_1981__22_2_129_0, author = {Lambek, J. and Scott, P. J.}, title = {Algebraic aspects of topos theory}, journal = {Cahiers de topologie et g\'eom\'etrie diff\'erentielle}, pages = {129--140}, publisher = {Dunod \'editeur, publi\'e avec le concours du CNRS}, volume = {22}, number = {2}, year = {1981}, mrnumber = {649793}, zbl = {0473.03064}, language = {en}, url = {http://archive.numdam.org/item/CTGDC_1981__22_2_129_0/} }