@article{MM_1990_2_10_a14,
     author = {V. A. Il'in and A. I. Zhilayev and V. V. Tikhomirov},
     title = {On solving eiconal equation in vertically non-homogeneous strata},
     journal = {Matemati\v{c}eskoe modelirovanie},
     pages = {141--156},
     publisher = {mathdoc},
     volume = {2},
     number = {10},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MM_1990_2_10_a14/}
}