@article{FAA_1980_14_1_a1,
     author = {M. G. Gasymov},
     title = {Spectral analysis of a class of second-order non-self-adjoint differential operators},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {14--19},
     publisher = {mathdoc},
     volume = {14},
     number = {1},
     year = {1980},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_1980_14_1_a1/}
}