@article{ZVMMF_1988_28_4_a2,
     author = {S. A. Ivanenko and A. A. Charakhch'yan},
     title = {Curvilinear grids of convex quadrilaterals},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {503--514},
     year = {1988},
     volume = {28},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1988_28_4_a2/}
}