In: Proc. of the 12th IMACS World Conf., Vol. 3, pages 503-510. 1988.
Also in: Breedveld, G.; et al.: IMACS Annals on Computing and Applied Mathematics, Vol. 3; Modelling and Simulation of Systems: Proceedings of the Twelfth IMACS World Congress on Scientific Computation, 1988, Paris, pages 111-118. Basel: Baltzer, 1989.