@article{ISU_2010_10_2_a3,
     author = {V. S. Rykhlov},
     title = {On multiple completeness of the root functions for a~class of the pencils of differential operators},
     journal = {Izvestiya of Saratov University. Mathematics. Mechanics. Informatics},
     pages = {24--34},
     publisher = {mathdoc},
     volume = {10},
     number = {2},
     year = {2010},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ISU_2010_10_2_a3/}
}