Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DAN_1969_185_3_a7, author = {V. S. Ryaben'kii}, title = {A boundary projection operator}, journal = {Doklady Akademii Nauk}, pages = {521--523}, publisher = {mathdoc}, volume = {185}, number = {3}, year = {1969}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1969_185_3_a7/} }
V. S. Ryaben'kii. A boundary projection operator. Doklady Akademii Nauk, Tome 185 (1969) no. 3, pp. 521-523. http://geodesic.mathdoc.fr/item/DAN_1969_185_3_a7/