Geodesic
A certain equation for the trajectories in light guides with variable refractive index
Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki, Tome 16 (1976) no. 4, pp. 943-955 
V. P. Varava; E. I. Ershov; R. P. Tarasov. A certain equation for the trajectories in light guides with variable refractive index. Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki, Tome 16 (1976) no. 4, pp. 943-955. http://geodesic.mathdoc.fr/item/ZVMMF_1976_16_4_a10/
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     title = {A certain equation for the trajectories in light guides with variable refractive index},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {943--955},
     year = {1976},
     volume = {16},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1976_16_4_a10/}
}
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