On a class of point-reflection geometries. - Herbert Hotje; Mario Marchi; Silvia Pianta (Discret. Math., 1994)

Kinematic mappings of plane affinities. - Herbert Hotje (Discret. Math., 1996)

A remark on the Beckman/Quarles theorem. - Herbert Hotje (Discret. Math., 1997)

On non-projective free Benz planes. - Herbert Hotje; Oddvar Iden (Discret. Math., 1999)

Skewaffine spaces in the language of distance spaces. - Herbert Hotje (Discret. Math., 2003)