@article{CTGDC_1986__27_2_93_0,
     author = {Barr, Michael},
     title = {Models of sketches},
     journal = {Cahiers de Topologie et G\'eom\'etrie Diff\'erentielle Cat\'egoriques},
     pages = {93--107},
     publisher = {Dunod \'editeur, publi\'e avec le concours du CNRS},
     volume = {27},
     number = {2},
     year = {1986},
     mrnumber = {850526},
     zbl = {0594.18001},
     language = {en},
     url = {http://www.numdam.org/item/CTGDC_1986__27_2_93_0/}
}