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@article{DAN_1980_250_3_a24, author = {A. I. Popykin}, title = {Spectral properties of the stationary diffusion multigroup approximation}, journal = {Doklady Akademii Nauk}, pages = {607--610}, publisher = {mathdoc}, volume = {250}, number = {3}, year = {1980}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1980_250_3_a24/} }
A. I. Popykin. Spectral properties of the stationary diffusion multigroup approximation. Doklady Akademii Nauk, Tome 250 (1980) no. 3, pp. 607-610. http://geodesic.mathdoc.fr/item/DAN_1980_250_3_a24/