@article{ZVMMF_1997_37_4_a4,
     author = {G. I. Shishkin},
     title = {Singularly perturbed boundary value problems with concentrated sources and discontinuous initial conditions},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {429--446},
     year = {1997},
     volume = {37},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1997_37_4_a4/}
}