Geodesic
Inverse Problem for Differential Operators on Spatial Networks with Different Orders on Different Edges
Trudy Moskovskogo matematičeskogo obŝestva, Trudy Moskovskogo Matematicheskogo Obshchestva, Tome 75 (2014) no. 2, pp. 125-138.

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We study the inverse problem of recovering differential operators from spectra on compact star-type graphs when differential equations have different orders on different edges. We provide a procedure for constructing the solution of the inverse problem and prove its uniqueness. 
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V. A. Yurko. Inverse Problem for Differential Operators on Spatial Networks with Different Orders on Different Edges. Trudy Moskovskogo matematičeskogo obŝestva, Trudy Moskovskogo Matematicheskogo Obshchestva, Tome 75 (2014) no. 2, pp. 125-138. http://geodesic.mathdoc.fr/item/MMO_2014_75_2_a2/

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