Voir la notice de l'article provenant de la source Math-Net.Ru
@article{TRSPY_1976_140_a13, author = {V. R. Portnov}, title = {S.\,L.~Sobolev projection operators for seminorms with infinite-dimensional kernels}, journal = {Informatics and Automation}, pages = {252--263}, publisher = {mathdoc}, volume = {140}, year = {1976}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/TRSPY_1976_140_a13/} }
V. R. Portnov. S.\,L.~Sobolev projection operators for seminorms with infinite-dimensional kernels. Informatics and Automation, Investigations in the theory of differentiable functions of many variables and its applications. Part 6, Tome 140 (1976), pp. 252-263. http://geodesic.mathdoc.fr/item/TRSPY_1976_140_a13/