@article{DE_1986_22_9_a23,
     author = {R. S. Makin},
     title = {The spectrum of multigroup diffusion approximation of the neutron transport equation},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1623--1626},
     publisher = {mathdoc},
     volume = {22},
     number = {9},
     year = {1986},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1986_22_9_a23/}
}