Analysis of the Cholesky Method with Iterative Refinement for Solving the Symmetric Definite Generalized Eigenproblem. - Philip I. Davies; Nicholas J. Higham; Françoise Tisseur (SIAM J. Matrix Anal. Appl., 2001)

A Schur-Parlett Algorithm for Computing Matrix Functions. - Philip I. Davies; Nicholas J. Higham (SIAM J. Matrix Anal. Appl., 2003)