Geodesic
Recovering differential operators on a~bush-type graph
Izvestiya of Saratov University. Mathematics. Mechanics. Informatics, Tome 9 (2009) no. 2, pp. 59-65.

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An inverse spectral problem is studied for Sturm–Liouville operators on arbitrary graphs with a cycle. A constructive procedure for the solution is provided and the uniquenness is established. 
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V. A. Yurko. Recovering differential operators on a~bush-type graph. Izvestiya of Saratov University. Mathematics. Mechanics. Informatics, Tome 9 (2009) no. 2, pp. 59-65. http://geodesic.mathdoc.fr/item/ISU_2009_9_2_a9/

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