S. A. Stepin, V. V. Fufaev, “Phase integral method in the problem of quasiclassical localization of spectra”, Doklady Mathematics, 91:3 (2015), 318–322
S. A. Stepin, V. V. Fufaev, “The phase-integral method in a problem of singular perturbation theory”, Izv. RAN. Ser. Mat., 81:2 (2017), 129–160; Izv. Math., 81:2 (2017), 359–390
V. V. Fufaev, “Level lines of harmonic functions related to some Abelian integrals”, Vestnik Moskov. Univ. Ser. 1. Mat. Mekh., 2017, no. 1, 16–25; Moscow University Mathematics Bulletin, 72:1 (2017), 15–23
S. A. Stepin, V. V. Fufaev, “Phase integral method in the problem of quasiclassical localization of spectra”, Dokl. Akad. Nauk, 462:3 (2015), 283–287; Dokl. Math., 91:3 (2015), 318–322
Об одной модельной задаче Штурма–Лиувилля S. A. Stepin, V. V. Fufaev Scientic seminar «Actual problems of geometry and mechanics » named after Prof. V.V. Trofimov February 27, 2015 20:30