@article{ZVMMF_1968_8_1_a25,
     author = {A. L. Duischko},
     title = {Difference method of solving the propagation of a light ray in a non-linear medium},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {238--242},
     publisher = {mathdoc},
     volume = {8},
     number = {1},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1968_8_1_a25/}
}