Combinatorial Obstructions to the Lifting of Weaving Diagrams. J. Richter-Gebert — 1993 Discrete & computational geometry
Two Constructions of Oriented Matroids with Disconnected Extension Space. J. Richter-Gebert; N.E. Mnëv — 1993 Discrete & computational geometry
Topological Representation of Dual Pairs of Oriented Matroids. G.M. Ziegler; J. Richter-Gebert — 1993 Discrete & computational geometry