@article{CTGDC_1981__22_1_3_0,
     author = {Johnstone, P. T.},
     title = {Factorization theorems for geometric morphisms, {I}},
     journal = {Cahiers de topologie et g\'eom\'etrie diff\'erentielle},
     pages = {3--17},
     publisher = {Dunod \'editeur, publi\'e avec le concours du CNRS},
     volume = {22},
     number = {1},
     year = {1981},
     mrnumber = {609154},
     zbl = {0454.18007},
     language = {en},
     url = {http://www.numdam.org/item/CTGDC_1981__22_1_3_0/}
}