On a quasilinear elliptic equation and a Riemannian metric invariant under Möbius transformations.
On a quasilinear elliptic equation and a Riemannian metric invariant under Möbius transformations. (Summary).
On affine planes non-extensible to Laguerre planes and some related problems
Some examples of affine planes non-extensible to a Laguerre plane are studied and conditions for the uniqueness of a Laguerre extension are given.
On an application of the theorem of Apollonius
On B. Segre's construction of an ovaloid
On finite circular spaces.
On free constructions.
On Havlíček-Tietze configuration in some non-Desarguesian planes
On Inscribed Circumscribed Conics.
On mappings preserving a single Lorentz-Minkowski-distance in Hjelmslev's classical plane.
On the coexistence of various geometries
On the geometry of field extensions.
On the Group of Transformations of Constructible Euclidean Planes with Preserve a Single Distance.
Ovals and non-ovoidal Laguerre planes.
Ovoids of the Hermitian surface in odd characteristic.