@article{FAA_1988_22_2_a22,
     author = {A. V. Turbiner},
     title = {Spectral {Riemann} surfaces of the {Sturm--Liouville} operator and quasiexactly solvable problems},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {92--94},
     publisher = {mathdoc},
     volume = {22},
     number = {2},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_1988_22_2_a22/}
}