@article{DAN_1963_150_5_a3,
     author = {M. G. Gasymov},
     title = {Analytic properties of the spectral function of the self-adjoint {Sturm--Liouville} operator},
     journal = {Doklady Akademii Nauk},
     pages = {971--974},
     publisher = {mathdoc},
     volume = {150},
     number = {5},
     year = {1963},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1963_150_5_a3/}
}