@article{VNGU_2017_17_1_a0,
     author = {Yu. E. Anikonov and N. B. Ayupova},
     title = {Ray expansions and identities for the second order equations with applications to inverse problems},
     journal = {Sibirskij \v{z}urnal \v{c}istoj i prikladnoj matematiki},
     pages = {3--16},
     publisher = {mathdoc},
     volume = {17},
     number = {1},
     year = {2017},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VNGU_2017_17_1_a0/}
}