A characterization of the Desarguesian planes of order by .
A characterization of the Hall planes by planar and nonplanar involutions.
A Characterization of the Lüneburg Planes.
A class of Buekenhout unitals in the Hall plane.
A Construction of a Skewaffine Structure in Laguerre Geometry
J. Andre constructed a skewaffine structure as a group space of a normally transitive group. In this paper his construction is used to describe the structure of the set of circles not passing through a point of a Laguerre plane. Sufficient conditions to ensure that this structure is a skewaffine plane are given.
A Generalization of Hadwiger's Transversal Theorem to Intersecting Sets.
A Geometric Characterization of Moufang Hexagons.
A geometrical characterization of the projective plane of order
A New Class of Quasifields.
A non-Desarguesian space geometry
A note on embedding and generating dual polar spaces.
A note on Pappus' theorem.
A note on tensor products of polar spaces over finite fields.
A Poncelet theorem in space.
A Resolution of the Sylvester-Gallai Problem of J.-P. Serre.
A rough classification of symmetric planes.
A survey of Sylvester's problem and its generalizations.
A universal algebra approach to free projective planes.
A universal algebra approach to free projective planes. (Short Communication).
About projective planes over weakly distributive skew-fields and systems.