@article{MZM_1979_25_6_a6,
     author = {S. A. Lomov and V. F. Safonov},
     title = {Regularization method for systems with a~weak nonlinearity in the resonance case},
     journal = {Matemati\v{c}eskie zametki},
     pages = {871--889},
     publisher = {mathdoc},
     volume = {25},
     number = {6},
     year = {1979},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1979_25_6_a6/}
}