Advanced preprocessing techniques for linear and quadratic programming. (Working paper of the Laboratory of Operations Research and Decision Systems (LORDS) WP 2002-6)
On the Cholesky factorization in interior point methods. (Working paper of the Laboratory of Operations Research and Decision Systems (LORDS) WP 2002-5)
Advanced preprocessing for simplex and interior point algorithms. Discussionsbeitrage des Fachbereichs Wirtschaftwissenschaft der Freien Universität. (Betriebswirtschaftliche, Reihe 13.)