@article{ISU_2021_21_3_a6,
     author = {V. A. Yurko},
     title = {Differential operators on graphs with a cycle},
     journal = {Izvestiya of Saratov University. Mathematics. Mechanics. Informatics},
     pages = {343--351},
     publisher = {mathdoc},
     volume = {21},
     number = {3},
     year = {2021},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ISU_2021_21_3_a6/}
}