@article{AA_2009_21_5_a5,
     author = {E. L. Korotyaev and D. S. Chelkak},
     title = {The inverse {Sturm{\textendash}Liouville} problem with mixed boundary conditions},
     journal = {Algebra i analiz},
     pages = {114--137},
     year = {2009},
     volume = {21},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AA_2009_21_5_a5/}
}