Voir la notice de l'article provenant de la source Math-Net.Ru
@article{IVM_1987_9_a7, author = {S. G. Kreǐn and S. Ya. L'vin}, title = {Overdetermined and underdetermined equations in {Hilbert} spaces}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {59--66}, publisher = {mathdoc}, number = {9}, year = {1987}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1987_9_a7/} }
S. G. Kreǐn; S. Ya. L'vin. Overdetermined and underdetermined equations in Hilbert spaces. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 9 (1987), pp. 59-66. http://geodesic.mathdoc.fr/item/IVM_1987_9_a7/