@article{SJVM_2019_22_4_a6,
     author = {A. G. Megrabov},
     title = {Conservation laws and other formulas for families of rays and wavefronts and for the eikonal equation},
     journal = {Sibirskij \v{z}urnal vy\v{c}islitelʹnoj matematiki},
     pages = {483--497},
     publisher = {mathdoc},
     volume = {22},
     number = {4},
     year = {2019},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/SJVM_2019_22_4_a6/}
}