Ash's Type II Theorem, Profinite Topology and Malcev Products: Part I. - Karsten Henckell; Stuart W. Margolis; Jean-Eric Pin; John Rhodes 001 (Int. J. Algebra Comput., 1991)

Idempotent Pointlike Sets. - Karsten Henckell (Int. J. Algebra Comput., 2004)

Stable Pairs. - Karsten Henckell (Int. J. Algebra Comput., 2010)

A Profinite Approach to Stable Pairs. - Karsten Henckell; John Rhodes 001; Benjamin Steinberg (Int. J. Algebra Comput., 2010)

Aperiodic Pointlikes and Beyond. - Karsten Henckell; John Rhodes 001; Benjamin Steinberg (Int. J. Algebra Comput., 2010)