@article{SJVM_1999_2_4_a6,
     author = {V. I. Paasonen},
     title = {The improved boundary conditions at the singular points of coordinate systems for non-stationary boundary value problems},
     journal = {Sibirskij \v{z}urnal vy\v{c}islitelʹnoj matematiki},
     pages = {373--384},
     publisher = {mathdoc},
     volume = {2},
     number = {4},
     year = {1999},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/SJVM_1999_2_4_a6/}
}