1. Discrete and Continuous Boundary Problems;Atkinson,1964
2. Yu.M. Berezanskii, Expansions in Eigenfunctions of Self-Adjoint Operators, Transl. Math. Monographs, vol. 17, Amer. Math. Soc., Providence, RI, 1968.
3. Inverse theorems for Jacobi matrices;Fu;J. Math. Anal. Appl.,1974
4. M.G. Gasymov, G.Sh. Guseinov, On inverse problems of spectral analysis for infinite Jacobi matrices in the limit-circle case, Dokl. Akad. Nauk SSSR 309 (1989) 1293–1296 (Russian); Engl. transl., Soviet Math. Dokl. 40 (1990) 627–630.
5. I.M. Gelfand, B.M. Levitan, On the determination of a differential equation from its spectral function, Izv. Akad. Nauk, Ser. Mat. 15 (1951) 309–360 (Russian); Engl. transl., Amer. Math. Soc. Transl. 1 (1963) 253–304.