On a Conjecture of Pierce for Permanents of Singular Correlation Matrices. - C. L. Frenzen; I. Fischer (SIAM J. Matrix Anal. Appl., 1993)

On the number of segments needed in a piecewise linear approximation. - C. L. Frenzen; Tsutomu Sasao; Jon T. Butler (J. Comput. Appl. Math., 2010)

A fast segmentation algorithm for piecewise polynomial numeric function generators. - Jon T. Butler; C. L. Frenzen; Njuguna Macaria; Tsutomu Sasao (J. Comput. Appl. Math., 2011)