@article{MZM_2009_86_5_a15,
     author = {S. S. Mirzoev and F. A. Gulieva},
     title = {On the {Completeness} of {Elementary} {Solutions} of a {Class} of {Second-Order} {Differential} {Equations} with {Operator} {Coefficients}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {797--800},
     publisher = {mathdoc},
     volume = {86},
     number = {5},
     year = {2009},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2009_86_5_a15/}
}