@article{CTGDC_1974__15_3_215_0,
     author = {Bastiani, Andr\'ee and Ehresmann, Charles},
     title = {Multiple functors. {I.} {Limits} relative to double categories},
     journal = {Cahiers de topologie et g\'eom\'etrie diff\'erentielle},
     pages = {215--292},
     publisher = {Dunod \'editeur, publi\'e avec le concours du CNRS},
     volume = {15},
     number = {3},
     year = {1974},
     mrnumber = {379626},
     zbl = {0332.18005},
     language = {en},
     url = {http://archive.numdam.org/item/CTGDC_1974__15_3_215_0/}
}