@article{ISU_2007_7_2_a4,
     author = {V. P. Kurdyumov and A. P. Khromov},
     title = {On {Riesz} basises of the eigen and associated functions of the functional-differential operator with a~variable structure},
     journal = {Izvestiya of Saratov University. Mathematics. Mechanics. Informatics},
     pages = {20--25},
     publisher = {mathdoc},
     volume = {7},
     number = {2},
     year = {2007},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ISU_2007_7_2_a4/}
}