%0 Journal Article %A V. A. Yurko %T Differential operators on graphs with a cycle %J Izvestiya of Saratov University. Mathematics. Mechanics. Informatics %D 2021 %P 343-351 %V 21 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/ISU_2021_21_3_a6/ %G en %F ISU_2021_21_3_a6