Numerical Stability of simple Geometric Algorithms in the plane. - Thomas Ottmann; Gerald Thiemt; Christian P. Ullrich (Computation Theory and Logic, 1987)

Numerical Stability of Geometric Algorithms. - Thomas Ottmann; Gerald Thiemt; Christian P. Ullrich (SCG, 1987)

An Optimal Algorithm for Approximating a Set of Rectangles by Two Minimum Area Rectangles. - Bruno Becker; Paolo Giulio Franciosa; Stephan Gschwind; Thomas Ohler; Gerald Thiemt; Peter Widmayer (Workshop on Computational Geometry, 1991)

Enclosing Many Boxes by an Optimal Pair of Boxes. - Bruno Becker; Paolo Giulio Franciosa; Stephan Gschwind; Thomas Ohler; Gerald Thiemt; Peter Widmayer (STACS, 1992)