On equations and properties concerning some classes of chordal polygons.
On equilateral simplices in normed spaces.
On finite circular spaces.
On finite near-circular spaces.
On finite projective planes in Lenz-Barlotti class at least I.3.
On flag-transitive anomalous -geometries.
On flocks of infinite quadratic cones.
On four-colourings of the rational four-space.
On free constructions.
On Gnomons
On Groupoids Having a Linear Congruence Class Geometry.
On groups with root system of type .
On Havlíček-Tietze configuration in some non-Desarguesian planes
On hyperplanes and free subspaces of affine Klingenberg spaces.
On hyperplanes and free subspaces of affine Klingenberg spaces. (Summary).
On Incidence Matrices of Finite Projective and Affine Spaces.
On inflection points of some type of quartics with a single triple point
On inflection points of the plane quartic with two nodal and one flexnodal points
On Inscribed Circumscribed Conics.
On Involutorial Elations of Projective Planes.