Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DAN_1971_197_4_a5, author = {I. M. Gel'fand and V. A. Ponomarev}, title = {Quadruples of subspaces of a finite-dimensional vector space}, journal = {Doklady Akademii Nauk}, pages = {762--765}, publisher = {mathdoc}, volume = {197}, number = {4}, year = {1971}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1971_197_4_a5/} }
I. M. Gel'fand; V. A. Ponomarev. Quadruples of subspaces of a finite-dimensional vector space. Doklady Akademii Nauk, Tome 197 (1971) no. 4, pp. 762-765. http://geodesic.mathdoc.fr/item/DAN_1971_197_4_a5/