@article{SJVM_2009_12_3_a7,
     author = {V. A. Tsetsocho and A. V. Belonosova and A. S. Belonosov},
     title = {Calculation formulas of linear geometrical spreading at ray tracing in {a~3D} block-inhomogeneous gradient medium},
     journal = {Sibirskij \v{z}urnal vy\v{c}islitelʹnoj matematiki},
     pages = {325--339},
     publisher = {mathdoc},
     volume = {12},
     number = {3},
     year = {2009},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/SJVM_2009_12_3_a7/}
}