@article{MZM_1971_9_1_a2,
     author = {Kh. Kh. Murtazin},
     title = {Spectrum of the nonself-adjoint {Schr\"odinger} operator in unbounded regions},
     journal = {Matemati\v{c}eskie zametki},
     pages = {19--26},
     publisher = {mathdoc},
     volume = {9},
     number = {1},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1971_9_1_a2/}
}