@article{CTGDC_1980__21_4_377_0,
     author = {Lawvere, F. William},
     title = {Toward the description in a smooth topos of the dynamically possible motions and deformations of a continuous body},
     journal = {Cahiers de topologie et g\'eom\'etrie diff\'erentielle},
     pages = {377--392},
     publisher = {Dunod \'editeur, publi\'e avec le concours du CNRS},
     volume = {21},
     number = {4},
     year = {1980},
     mrnumber = {606383},
     zbl = {0472.18009},
     language = {en},
     url = {http://archive.numdam.org/item/CTGDC_1980__21_4_377_0/}
}