@article{MZM_2005_77_1_a13,
     author = {M. A. Poteryakhin},
     title = {Normal forms near an invariant torus and the asymptotic eigenvalues of the operator $\langle V,\nabla\rangle-\epsilon\Delta$},
     journal = {Matemati\v{c}eskie zametki},
     pages = {152--156},
     publisher = {mathdoc},
     volume = {77},
     number = {1},
     year = {2005},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2005_77_1_a13/}
}