Combinatorial d-Tori with a Large Symmetry Group. W. Kühnel; G. Lassmann — 1988 Discrete & computational geometry
Categorical approach to nonlinear constant continuous-time systems H. Ehrig; W. Kühnel — 1979 RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications
Manifold structures on abstract regular polytopes. Ulrich Brehm; W. Kühnel; Egon Schulte — 1995 Aequationes mathematicae