@article{MM_1999_11_11_a5,
     author = {G. I. Shishkin},
     title = {Grid approximation of singularly perturbed boundary value problems in a~nonconvex domain with a~piecewise smooth boundary},
     journal = {Matemati\v{c}eskoe modelirovanie},
     pages = {75--90},
     publisher = {mathdoc},
     volume = {11},
     number = {11},
     year = {1999},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MM_1999_11_11_a5/}
}