@article{MZM_2018_104_3_a2,
     author = {A. O. Babayan and S. O. Abelyan},
     title = {Defect {Numbers} of the {Dirichlet} {Problem} for a {Properly} {Elliptic} {Sixth-Order} {Equation}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {345--355},
     publisher = {mathdoc},
     volume = {104},
     number = {3},
     year = {2018},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2018_104_3_a2/}
}