@article{DAN_1961_136_3_a14,
     author = {V. V. Sobolev},
     title = {Diffuse irradiation in a medium with mirror reflecting boundaries},
     journal = {Doklady Akademii Nauk},
     pages = {571--574},
     publisher = {mathdoc},
     volume = {136},
     number = {3},
     year = {1961},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1961_136_3_a14/}
}