@article{MZM_2009_86_6_a14,
     author = {Ya. T. Sultanaev and O. V. Myakinova},
     title = {On the {Deficiency} {Indices} of a {Singular} {Differential} {Operator} of {Fourth} {Order} in the {Space} of {Vector} {Functions}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {950--953},
     publisher = {mathdoc},
     volume = {86},
     number = {6},
     year = {2009},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2009_86_6_a14/}
}