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@article{DAN_1983_270_5_a0, author = {A. M. Astashov}, title = {Normal forms of {Hamiltonian} operators in field theory}, journal = {Doklady Akademii Nauk}, pages = {1033--1037}, publisher = {mathdoc}, volume = {270}, number = {5}, year = {1983}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1983_270_5_a0/} }
A. M. Astashov. Normal forms of Hamiltonian operators in field theory. Doklady Akademii Nauk, Tome 270 (1983) no. 5, pp. 1033-1037. http://geodesic.mathdoc.fr/item/DAN_1983_270_5_a0/