@article{FAA_1987_21_2_a7,
     author = {M. I. Belishev},
     title = {Inverse spectral indefinite problem for the equation $y''+\lambda p(x)y=0$ on an interval},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {68--69},
     publisher = {mathdoc},
     volume = {21},
     number = {2},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_1987_21_2_a7/}
}