@article{CMH_1931__3_138557,
     author = {Georges de Rham},
     title = {Sur les p\'eriodes des int\'egrales de premi\`ere esp\`ece attach\'ee \`a une vari\'et\'e alg\'ebrique.},
     journal = {Commentarii mathematici Helvetici},
     pages = {151--153},
     publisher = {mathdoc},
     volume = {3},
     year = {1931},
     zbl = {0002.03402},
     url = {http://geodesic.mathdoc.fr/item/CMH_1931__3_138557/}
}