@article{ND_2020_16_2_a10,
     author = {E. I. Kugushev and T. V. Popova},
     title = {Estimation of the {Accuracy} of the {Averaging} {Method} for {Systems} with {Multifrequency} {Perturbations}},
     journal = {Russian journal of nonlinear dynamics},
     pages = {379--394},
     publisher = {mathdoc},
     volume = {16},
     number = {2},
     year = {2020},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ND_2020_16_2_a10/}
}