Test cases

[lbenet]

This comes from the (Reliable_computing) mailing list, (posted by Mark A. Stadtherr):

• Minimization problems: http://dx.doi.org/10.1021/ie034073d

• Equation-solving problems (with many roots): http://dx.doi.org/10.1002/aic.690470817

• Other interesting problems/methods by perusing: https://www3.nd.edu/~markst/interval-publications.html