For citations:

Butuzov V.F., Beloshapko V.A. Singularly Perturbed Elliptic Dirichlet Problem with a Multiple Root of the Degenerate Equation. Modeling and Analysis of Information Systems. 2016;23(5):515-528. (In Russ.) https://doi.org/10.18255/1818-1015-2016-5-515-528