@article{VSGU_2009_6_a1,
     author = {N. F. Valeev and S. A. Rabtsevich and E. R. Nugumanov},
     title = {About the problem of characterization of the {Shturm{\textendash}Loiuville} operator's boundary conditions by the spectrum},
     journal = {Vestnik Samarskogo universiteta. Estestvennonau\v{c}na\^a seri\^a},
     pages = {12--20},
     year = {2009},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VSGU_2009_6_a1/}
}