eigenvalues is presented. The method combines the approach developed by Rundell and
Coworkers (SIAM Monographs on Mathematical Modeling and Computation. SIAM:
Philadelphia, PA;(1997)) for solving inverse Sturm–Liouville problems with a recent result by
Kravchenko (Complex Variables and Elliptic Equations 2008; 53 (8): 775–789) giving
accurate solutions of direct problems.