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)

A Kemel Architecture for a Computer Aided Knowledge Engineering Workbench. - Zeger Karssen; Catherine Toussaint (SEKE, 1992)