@article{VTPMK_2022_1_a1,
     author = {V. I. Uskov},
     title = {Asymptotic expansions of solutions of singularly perturbed equations},
     journal = {Vestnik Tverskogo gosudarstvennogo universiteta. Seri\^a Prikladna\^a matematika},
     pages = {18--32},
     publisher = {mathdoc},
     number = {1},
     year = {2022},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VTPMK_2022_1_a1/}
}