P. Puschner, and A. Schedl. Kluwer Academic Publishers, Boston, (May 1991),,1-27()
(C)Kluwer Academic Publishers, Boston. Manufactured in The Netherlands.
PETER P. PUSCHNER AND ANTON V. SCHEDL
Institut fur Technische Informatik, Technische Universitat Wien
Institut fur Technische Informatik, TechnA-1040 Vienna,
Austria.