@article{ZNSL_1984_140_a2,
     author = {S. A. Vakulenko},
     title = {Construction of asymptotic solutions for weakly nonlinear {Hamiltonian} systems},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {36--40},
     publisher = {mathdoc},
     volume = {140},
     year = {1984},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1984_140_a2/}
}