Geodesic
Averaging in systems containing several small parameters
Matematičeskie zametki, Tome 16 (1974) no. 1, pp. 75-82 
B. V. Aleshin. Averaging in systems containing several small parameters. Matematičeskie zametki, Tome 16 (1974) no. 1, pp. 75-82. http://geodesic.mathdoc.fr/item/MZM_1974_16_1_a8/
@article{MZM_1974_16_1_a8,
     author = {B. V. Aleshin},
     title = {Averaging in systems containing several small parameters},
     journal = {Matemati\v{c}eskie zametki},
     pages = {75--82},
     year = {1974},
     volume = {16},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1974_16_1_a8/}
}
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Voir la notice de l'article provenant de la source Math-Net.Ru

In this note we consider a system of differential equations containing several small parameters with various orders of smallness. We propose a method of obtaining a “diagonally” averaged system, based on successive application of an averaging process along the trajectories of so-called degenerate systems.