Voir la notice de l'article provenant de la source Math-Net.Ru
@article{IVM_1963_4_a1, author = {V. A. Baskakov}, title = {On a~construction of positive linear operators for functions of two variables}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {7--14}, publisher = {mathdoc}, number = {4}, year = {1963}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1963_4_a1/} }
V. A. Baskakov. On a~construction of positive linear operators for functions of two variables. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 4 (1963), pp. 7-14. http://geodesic.mathdoc.fr/item/IVM_1963_4_a1/