@article{EMJ_2012_3_4_a1,
     author = {A. M. Akhtyamov and V. A. Sadovnichy and Ya. T. Sultanaev},
     title = {Generalizations of {Borg's} uniqueness theorem to the case of nonseparated boundary conditions},
     journal = {Eurasian mathematical journal},
     pages = {10--22},
     year = {2012},
     volume = {3},
     number = {4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EMJ_2012_3_4_a1/}
}