@article{ND_2012_8_3_a9,
     author = {Valery V. Kozlov},
     title = {An extended {Hamilton{\textendash}Jacobi} method},
     journal = {Russian journal of nonlinear dynamics},
     pages = {549--568},
     year = {2012},
     volume = {8},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ND_2012_8_3_a9/}
}