Co-Author: with Dr. Thomas Heidel, §§ 327a-327f AktG in Anwaltkommentar Aktienrecht, 2003, §§ 147-149 AktG, vor §§ 327a-327f, §§ 327a-327f AktG (with Dr. Thomas Heidel), §§ 39a-39c WpÜG (with Dr. Thomas Heidel), Aktienrecht und Kapitalmarktrecht 2nd and 3rd edition, 2007-2011; §§ 21-40, §§ 55-73, §§ 77-79 BGB in Anwaltkommentar BGB 2005 (new edition: Nomos Kommentar 2011).