On stability of inverse problems of spectral analysis for equations of mathematical physics
V. V. Dubrovskii

References
1.	Isosakii H., J. Wath. Kyoto Univ., 31:3 (1991), 743–753
2.	Alessandrini G., Sylvester J., Com. Part. Dif. Eq., 15:5 (1990), 711–736
3.	Novikov R. G., Khenkin G. M., Russian Math. Survey, 42 (1987), 109–180