Tangents of conics in Hjelmslev planes over a local ring of even characteristic
The cross-ratio in Hjelmslev planes
The cross-ratio in Hjelmslev planes is defined. The cross-ratio in the Hjelmslev plane is independent of the choice of a coordinate system on a line.
Time series with random parameters [Abstract of thesis]
Transversal designs and partitions associated with Frobenius groups.
Twisted projective spaces and linear completions of some partial Steiner triple systems.