Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DAN_1977_236_6_a4, author = {M. I. Levin and Yu. M. Girshovich}, title = {Extremal problems for cubature formulas}, journal = {Doklady Akademii Nauk}, pages = {1303--1306}, publisher = {mathdoc}, volume = {236}, number = {6}, year = {1977}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1977_236_6_a4/} }
M. I. Levin; Yu. M. Girshovich. Extremal problems for cubature formulas. Doklady Akademii Nauk, Tome 236 (1977) no. 6, pp. 1303-1306. http://geodesic.mathdoc.fr/item/DAN_1977_236_6_a4/