2 citations to https://www.mathnet.ru/rus/semr1363

1. V. I. Kachalov, “Pseudoholomorphic and $\varepsilon $-Pseudoregular Solutions of Singularly Perturbed Problems”, Diff Equat, 58:3 (2022), 357  
2. Dana Bibulova, Burkhan Kalimbetov, Valeriy Safonov, “Regularized Asymptotic Solutions of a Singularly Perturbed Fredholm Equation with a Rapidly Varying Kernel and a Rapidly Oscillating Inhomogeneity”, Axioms, 11:3 (2022), 141