@article{MZ_1971__121_171572,
     author = {Pierre Leroux},
     title = {Sur les structures d'effacement.},
     journal = {Mathematische Zeitschrift},
     pages = {329--340},
     publisher = {mathdoc},
     volume = {121},
     year = {1971},
     zbl = {0211.32401},
     url = {http://geodesic.mathdoc.fr/item/MZ_1971__121_171572/}
}