@article{ISU_2007_7_1_a0,
     author = {M. Sh. Burlutskaya and A. P. Khromov},
     title = {On convergence of {Riesz} means of the expansions in eigenfunctions of a~functional-differential operator on 
},
     journal = {Izvestiya of Saratov University. Mathematics. Mechanics. Informatics},
     pages = {3--8},
     publisher = {mathdoc},
     volume = {7},
     number = {1},
     year = {2007},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ISU_2007_7_1_a0/}
}