Finite linear spaces with two more lines than points.
Finite translation planes, an exposition.
Flexible cross-polytopes in the Euclidean 4-space.
Formules fondamentales de géométrie tricirculaire et tétrasphérique
Foyers des surfaces du second ordre
Foyers et directrices des surfaces du second ordre
Foyers et directrices des surfaces du second ordre
Free constructions of 2-structures
Freie quasiaffine Ebenenerweiterungen.
Functional equation associated with triangle geometry. (Summary).
Functional equations associated with triangle geometry.
Funktionale von primitiven Polygonen Kleinscher Ebenen.
Further thoughts on a focusing property of the ellipse.