A simple method is outlined for calculating the singular values of an interval matrix with some restricted width. It uses a sensitivity analysis approach to choose among the possible values of the matrix entries to extremize the singular values. © 1991.
Deif, A. S. (1991). Singular values of an interval matrix. Linear Algebra and Its Applications, 151(C), 125–133. https://doi.org/10.1016/0024-3795(91)90358-4