@article{IVM_1980_1_a8,
     author = {I. Sobirov},
     title = {The existence of a~second eigenvalue of a~linear integral operator with a~nonnegative kernel},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {50--52},
     publisher = {mathdoc},
     number = {1},
     year = {1980},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1980_1_a8/}
}