@article{MZM_2013_94_3_a3,
     author = {K. A. Kerimov and S. S. Mirzoyev},
     title = {On a {Problem} for {Operator-Differential} {Second-Order} {Equations} with {Nonlocal} {Boundary} {Condition}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {349--353},
     publisher = {mathdoc},
     volume = {94},
     number = {3},
     year = {2013},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2013_94_3_a3/}
}