@article{CTGDC_1978__19_1_3_0,
     author = {Porter, Timothy},
     title = {Coherent prohomotopy theory},
     journal = {Cahiers de Topologie et G\'eom\'etrie Diff\'erentielle Cat\'egoriques},
     pages = {3--46},
     publisher = {Dunod \'editeur, publi\'e avec le concours du CNRS},
     volume = {19},
     number = {1},
     year = {1978},
     mrnumber = {496541},
     zbl = {0387.55013},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CTGDC_1978__19_1_3_0/}
}