On Trigonometry in Beltrami–Klein Model of Hyperbolic Geometry 
Fall 
2013 
Elliptic Reflection Structures, KLoop Derivations and TriangleInequality 
February 
2011 
Reflection Spaces, Partial KLoops and KLoops 
April 
2011 
Bemerkungen zum Beweis des Darstellungssatzes für miquelsche MöbiusEbenen von A. Lenard 
July 

Reflection Spaces and Corresponding Kinematic Structures 
July 

On M¨obius Spaces Admitting Automorphism Groups of Type II.2 
July 

On Algebraic Structures Related to Beltrami–Klein Model of Hyperbolic Geometry 
July 

On Characterization of Absolute Geometries 
July 

On the Minkowski Planes Constructed by Artzy and Groh 
July 

Defect and Area in Beltrami–Klein Model of Hyperbolic Geometry 
July 
