@article{ZVMMF_2003_43_5_a2,
     author = {G. I. Shishkin},
     title = {Approximation of solutions and derivative of singularly perturbed elliptic equation of convection-diffusion},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {672--689},
     year = {2003},
     volume = {43},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_2003_43_5_a2/}
}