A Conceptual Modelling Framework for Knowledge-level Reflection. - Martin Reinders; Erik Vinkhuyzen; Angi Voß; Hans Akkermans; John Balder; Brigitte Bartsch-Spörl; Bert Bredeweg; Uwe Drouven; Frank van Harmelen; Werner Karbach; Zeger Karssen; Guus Schreiber; et al. (AI Commun., 1991)

(ML)2: A Formal Language for KADS Models. - Frank van Harmelen; John Balder (ECAI, 1992)

TheME: an Environment for Building Formal KADS-II Models of Expertise. - John Balder; Hans Akkermans (AI Commun., 1992)

(ML)2: A formal language for KADS models of expertise. - Frank van Harmelen; John Balder (Knowl. Acquis., 1992)