O úhlech nesouměřitelných
On a general principle in geometry that leads to functional equations.
On Brocard points in the isotropic plane.
On distance preserving transformations of lines in Euclidean three-space.
On the bisectors of weakly separable sets.
On the Contact Dimension of Graphs.
On the foundation of geometry.
On the Group of Transformations of Constructible Euclidean Planes with Preserve a Single Distance.
On the planarity of the equilateral, isogonal pentagon.
On the plane geometry with generalized absolute value metric.