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@article{DAN_1969_185_4_a7, author = {G. I. Laptev}, title = {On the theory of the operational calculus of linear unbounded operators}, journal = {Doklady Akademii Nauk}, pages = {760--763}, publisher = {mathdoc}, volume = {185}, number = {4}, year = {1969}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1969_185_4_a7/} }
G. I. Laptev. On the theory of the operational calculus of linear unbounded operators. Doklady Akademii Nauk, Tome 185 (1969) no. 4, pp. 760-763. http://geodesic.mathdoc.fr/item/DAN_1969_185_4_a7/