@article{ZNSL_1985_148_a4,
     author = {S. A. Vakulenko},
     title = {Asymptotic integration of some class of weakly nonlinear {Hamilton} systems},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {42--51},
     publisher = {mathdoc},
     volume = {148},
     year = {1985},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1985_148_a4/}
}