@article{DAN_1973_209_5_a19,
     author = {V. V. Sobolev},
     title = {The relationship between emissivity and absorptivity of media},
     journal = {Doklady Akademii Nauk},
     pages = {1071--1073},
     publisher = {mathdoc},
     volume = {209},
     number = {5},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1973_209_5_a19/}
}