Geodesic
Inverse problem for an operator pencil with nonseparated boundary conditions
Eurasian mathematical journal, Tome 1 (2010) no. 2, pp. 5-16

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In this work an inverse problem of spectral analysis for a quadratic pencil of operators with general nonselfadjoint nonseparated boundary conditions is considered. Uniqueness and duality theorems are proved, an algoritm for solving the problem is presented. Apropriate examples and counterexample are given. 
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A. M. Akhtyamov; V. A. Sadovnichy; Ya. T. Sultanaev. Inverse problem for an operator pencil with nonseparated boundary conditions. Eurasian mathematical journal, Tome 1 (2010) no. 2, pp. 5-16. http://geodesic.mathdoc.fr/item/EMJ_2010_1_2_a0/