@article{FAA_1972_6_2_a10,
     author = {M. M. Gekhtman},
     title = {On the spectrum of an operator {Sturm--Liouville} equation},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {81--82},
     publisher = {mathdoc},
     volume = {6},
     number = {2},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_1972_6_2_a10/}
}