@article{DAN_1974_214_6_a11,
     author = {I. A. Fel'dman},
     title = {On the finiteness of the discrete spectrum of the characteristic equation in the theory of radiative transfer},
     journal = {Doklady Akademii Nauk},
     pages = {1280--1283},
     publisher = {mathdoc},
     volume = {214},
     number = {6},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1974_214_6_a11/}
}