In: Proceedings of the IFIP WG 5.7 Working Conference on Integration in Production Management Systems, Eindhoven, The Netherlands, pages 203-218. 1992.
Also in: Pels, H.J.; Wortmann, J.C.: Integration in Production Management Systems, IFIP Transactions, Vol. B-7, pages 277-292. Amsterdam: Elsevier Science Publishers, 1992.