@article{CTGDC_1976__17_3_261_0,
     author = {Frei, Armin},
     title = {On categorical shape theory},
     journal = {Cahiers de topologie et g\'eom\'etrie diff\'erentielle},
     pages = {261--294},
     publisher = {Dunod \'editeur, publi\'e avec le concours du CNRS},
     volume = {17},
     number = {3},
     year = {1976},
     mrnumber = {439911},
     zbl = {0341.55015},
     language = {en},
     url = {http://www.numdam.org/item/CTGDC_1976__17_3_261_0/}
}