On the classification of unitals on 28 points of low rank, Vladimir Tonchev, Alfred Wassermann
Michigan Tech Publications

The classification of Steiner triple systems on 27 points with 3-rank 24, Dieter Jungnickel, Spyros Magliveras, Vladimir Tonchev, Alfred Wassermann
Department of Mathematical Sciences Publications

On classifying Steiner triple systems by their 3-rank, Dieter Jungnickel, Spyros Magliveras, Vladimir Tonchev, Alfred Wassermann
Department of Mathematical Sciences Publications

Mutually disjoint designs and new 5‐designs derived from groups and codes, Makoto Araya, Masaaki Harada, Vladimir Tonchev, Alfred Wassermann
Department of Mathematical Sciences Publications