@article{CTGDC_1973__14_4_371_0,
     author = {Bourn, Dominique},
     title = {Natural anadeses and catadeses},
     journal = {Cahiers de topologie et g\'eom\'etrie diff\'erentielle},
     pages = {371--415},
     publisher = {Dunod \'editeur, publi\'e avec le concours du CNRS},
     volume = {14},
     number = {4},
     year = {1973},
     mrnumber = {354808},
     zbl = {0323.18003},
     language = {en},
     url = {http://archive.numdam.org/item/CTGDC_1973__14_4_371_0/}
}