Author's Argumentation Assistant (AAA): A Hypertext-Based Authoring Tool for Argumentative Texts. - Wolfgang Schuler; John B. Smith (ECHT, 1990)

SEPIA: A Cooperative Hypermedia Authoring Environment. - Norbert A. Streitz; Jörg M. Haake; Jörg Hannemann; Andreas C. Lemke; Wolfgang Schuler; Helge Schütt; Manfred Thüring (ECHT, 1992)