@article{CTGDC_1981__22_2_201_0,
     author = {Hilton, Peter and Roitberg, Joseph},
     title = {Restoration of structure},
     journal = {Cahiers de topologie et g\'eom\'etrie diff\'erentielle},
     pages = {201--207},
     publisher = {Dunod \'editeur, publi\'e avec le concours du CNRS},
     volume = {22},
     number = {2},
     year = {1981},
     mrnumber = {649800},
     zbl = {0468.55006},
     language = {en},
     url = {http://archive.numdam.org/item/CTGDC_1981__22_2_201_0/}
}