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@article{DE_1974_10_2_a12, author = {V. V. Barkovskii}, title = {Expansion in the eigenfunctions of two pseudodifferential operators}, journal = {Differencialʹnye uravneni\^a}, pages = {276--280}, publisher = {mathdoc}, volume = {10}, number = {2}, year = {1974}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1974_10_2_a12/} }
V. V. Barkovskii. Expansion in the eigenfunctions of two pseudodifferential operators. Differencialʹnye uravneniâ, Tome 10 (1974) no. 2, pp. 276-280. http://geodesic.mathdoc.fr/item/DE_1974_10_2_a12/