@article{MZM_2004_76_5_a5,
     author = {S. Yu. Dobrokhotov and M. A. Poteryakhin},
     title = {Normal {Forms} near {Two-Dimensional} {Resonance} {Tori} for the {Multidimensional} {Anharmonic} {Oscillator}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {701--713},
     publisher = {mathdoc},
     volume = {76},
     number = {5},
     year = {2004},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2004_76_5_a5/}
}