1. Akhiezer, N.I., Continuous Analogs of Orthogonal Polynomials on a System of Intervals, Dokl. Akad. Nauk SSSR, 1961, vol. 141, no. 2, pp. 262–266.
2. Hochstadt, H. and Goldberg, W., An Inverse Problem for a Differential Operator with a Mixed Spectrum, J. Math. Anal. Appl., 1985, vol. 105, pp. 206–221.
3. Levitan, B.M. and Savin, A.V., An Inverse Problem on the Half Line for Finite-Gap Potentials, Vestnik Moskov. Univ. Ser. I Mat. Mekh., 1988, no. 1, pp. 21–28.
4. Hochstadt, H., On the Determination of Hill’s Equation from Its Spectrum, Arch. Ration. Mech. Anal., 1965, vol. 19, pp. 353–362.
5. Stankevich, I.V., A Certain Inverse Spectral Analysis Problem for Hill’s Equation, Dokl. Akad. Nauk SSSR, 1970, vol. 192, no. 1, pp. 34–37.