@article{RM_1977_32_5_a15,
     author = {Yu. I. Kifer},
     title = {The spectrum of some differential operators with a~small parameter multiplying highest derivatives},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     publisher = {mathdoc},
     volume = {32},
     number = {5},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/RM_1977_32_5_a15/}
}