Geodesic
On convergence of Riesz means of the expansions in eigenfunctions of a~functional-differential operator on
Izvestiya of Saratov University. Mathematics. Mechanics. Informatics, Tome 7 (2007) no. 1, pp. 3-8.

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The paper deals with necessary and sufficient conditions of uniform convergence of generalized Riesz means for the expansions in eigen and associated functions of the 1-st order functional-differential operator on the graph with three ribs forming a cycle. 
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M. Sh. Burlutskaya; A. P. Khromov. On convergence of Riesz means of the expansions in eigenfunctions of a~functional-differential operator on. Izvestiya of Saratov University. Mathematics. Mechanics. Informatics, Tome 7 (2007) no. 1, pp. 3-8. http://geodesic.mathdoc.fr/item/ISU_2007_7_1_a0/

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