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@article{MZM_1988_43_1_a7, author = {V. M. Koltyzhenkov}, title = {Nonregular variational equations along quasiperiodic solutions of {Hamiltonian} systems}, journal = {Matemati\v{c}eskie zametki}, pages = {62--70}, publisher = {mathdoc}, volume = {43}, number = {1}, year = {1988}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1988_43_1_a7/} }
V. M. Koltyzhenkov. Nonregular variational equations along quasiperiodic solutions of Hamiltonian systems. Matematičeskie zametki, Tome 43 (1988) no. 1, pp. 62-70. http://geodesic.mathdoc.fr/item/MZM_1988_43_1_a7/