Algebraic methods for computing smallest enclosing and circumscribing cylinders of simplices

René Brandenberg Thorsten Theobald Algebraic methods for computing smallest enclosing and circumscribing cylinders of simplices http://arxiv.org/abs/math.OC/0211344 2002 CoRR math.OC/0211344 db/journals/corr/corr0211.html#math-OC-0211344