@article{ND_2020_16_3_a6,
     author = {V. V. Smirnov and L. I. Manevitch},
     title = {Complex {Envelope} {Variable} {Approximation
}},
     journal = {Russian journal of nonlinear dynamics},
     pages = {491--515},
     publisher = {mathdoc},
     volume = {16},
     number = {3},
     year = {2020},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ND_2020_16_3_a6/}
}