Zlatko ERJAVEC: 3D homogeneous geometries and some special surfaces Faculty of Organization and Informatics, University of Zagreb, Croatia

Cornelie LEOPOLD: Structural and geometric concepts for architectural design processes Kaiserslautern University of Technology, Germany

Otto RÖSCHEL: Planar kinematics and overconstrained spatial mechanisms Graz University of Technology, Austria

Vladimir VOLENEC: Three-bar curves, asymmetric propellers and idempotent medial quasigroups Department of Mathematics, Faculty of Science, University of Zagreb, Croatia