@article{MMO_1954_3_a6,
     author = {M. A. Krasnosel'skii and L. A. Ladyzhenskii},
     title = {The structure of the spectrum of positive nonhomogeneous operators},
     journal = {Trudy Moskovskogo matemati\v{c}eskogo ob\^{s}estva},
     pages = {321--346},
     publisher = {mathdoc},
     volume = {3},
     year = {1954},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MMO_1954_3_a6/}
}