@article{DE_1991_27_9_a16,
     author = {G. M. Sydykov and A. D. Sariev},
     title = {Inverse problems for the nonstationary transport equation in plane-parallel geometry},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1617--1625},
     publisher = {mathdoc},
     volume = {27},
     number = {9},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1991_27_9_a16/}
}