@article{CTGDC_1978__19_1_87_0,
     author = {Ehresmann, Andr\'ee and Ehresmann, Charles},
     title = {Tensor products of topological ringoids},
     journal = {Cahiers de topologie et g\'eom\'etrie diff\'erentielle},
     pages = {87--112},
     publisher = {Dunod \'editeur, publi\'e avec le concours du CNRS},
     volume = {19},
     number = {1},
     year = {1978},
     mrnumber = {491885},
     zbl = {0391.18011},
     language = {en},
     url = {http://www.numdam.org/item/CTGDC_1978__19_1_87_0/}
}