@article{MAIS_2016_23_5_a0,
     author = {V. F. Butuzov and V. A. Beloshapko},
     title = {Singularly perturbed elliptic {Dirichlet} problem with a multiple root of the degenerate equation},
     journal = {Modelirovanie i analiz informacionnyh sistem},
     pages = {515--528},
     publisher = {mathdoc},
     volume = {23},
     number = {5},
     year = {2016},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MAIS_2016_23_5_a0/}
}