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@article{DAN_1976_230_2_a4, author = {G. M. Lyan}, title = {On the kernel of {Poincar\'es} $\theta$-operator}, journal = {Doklady Akademii Nauk}, pages = {269--270}, publisher = {mathdoc}, volume = {230}, number = {2}, year = {1976}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1976_230_2_a4/} }
G. M. Lyan. On the kernel of Poincar\'es $\theta$-operator. Doklady Akademii Nauk, Tome 230 (1976) no. 2, pp. 269-270. http://geodesic.mathdoc.fr/item/DAN_1976_230_2_a4/