@article{EMJ_2013_4_3_a4,
     author = {N. S. Imanbaev and M. A. Sadybekov},
     title = {On spectral properties of a~periodic problem with an integral perturbation of the boundary condition},
     journal = {Eurasian mathematical journal},
     pages = {53--62},
     publisher = {mathdoc},
     volume = {4},
     number = {3},
     year = {2013},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EMJ_2013_4_3_a4/}
}