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@article{DAN_1992_324_1_a2, author = {V. V. Ditkin}, title = {On the root subspaces of a two-parameter spectral problem}, journal = {Doklady Akademii Nauk}, pages = {20--23}, publisher = {mathdoc}, volume = {324}, number = {1}, year = {1992}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1992_324_1_a2/} }
V. V. Ditkin. On the root subspaces of a two-parameter spectral problem. Doklady Akademii Nauk, Tome 324 (1992) no. 1, pp. 20-23. http://geodesic.mathdoc.fr/item/DAN_1992_324_1_a2/