@article{CTGDC_1993__34_2_153_0,
     author = {Joyal, Andr\'e and Street, Ross},
     title = {Pullbacks equivalent to pseudopullbacks},
     journal = {Cahiers de Topologie et G\'eom\'etrie Diff\'erentielle Cat\'egoriques},
     pages = {153--156},
     publisher = {Dunod \'editeur, publi\'e avec le concours du CNRS},
     volume = {34},
     number = {2},
     year = {1993},
     mrnumber = {1223657},
     zbl = {0780.18004},
     language = {en},
     url = {http://archive.numdam.org/item/CTGDC_1993__34_2_153_0/}
}