@article{CTGDC_1969__11_2_131_0,
     author = {Chacron, J.},
     title = {Structures relationnelles},
     journal = {Cahiers de topologie et g\'eom\'etrie diff\'erentielle},
     pages = {131--200},
     publisher = {Dunod \'editeur, publi\'e avec le concours du CNRS},
     volume = {11},
     number = {2},
     year = {1969},
     mrnumber = {264582},
     zbl = {0191.01103},
     language = {fr},
     url = {http://www.numdam.org/item/CTGDC_1969__11_2_131_0/}
}