@article{CMH_1947__20_138917,
     author = {Jean Leray},
     title = {Une d\'efinition g\'eom\'etrique de l'anneau de cohomologie d'une multiplicit\'e.},
     journal = {Commentarii mathematici Helvetici},
     pages = {177--180},
     publisher = {mathdoc},
     volume = {20},
     year = {1947},
     zbl = {0035.24903},
     url = {http://geodesic.mathdoc.fr/item/CMH_1947__20_138917/}
}