A Better Lower Bound for Two-Circle Point Labeling. - Alexander Wolff 001; Michael Thon; Yin-Feng Xu (ISAAC, 2000)

A Simple Factor-2/3 Approximation Algorithm for Two-Circle Point Labeling. - Alexander Wolff 001; Michael Thon; Yin-Feng Xu (Int. J. Comput. Geom. Appl., 2002)

IK 2009. - Michael Thon (Künstliche Intell., 2009)

Spectral Learning of Sequential Systems. - Michael Thon (2018)