References

Prof. Robert S. Orr, B Sc, Ph D Department of Physics University of Toronto 60 St. George Street Toronto, Ontario Canada M5S 1A7 Tel.: +1 (416) 978-6029 Fax: +1 (416) 978-8221 E-mail: orr@physics.utoronto.ca	Prof. Derek A. L. Paul, BA, Ph D Department of Physics University of Toronto 60 St. George Street Toronto, Ontario Canada M5S 1A7 Tel.: +1 (416) 978-2971 Fax: +1 (416) 978-1547 E-mail: paul@physics.utoronto.ca
Prof. Dr Albrecht Goldmann Department of Physics University of Kassel 34132 Kassel, Germany Tel.: +49 (561) 804-4434 Fax: +49 (561) 804-4518 E-mail: goldmann@physik.uni-kassel.de	Prof. Dr Burkhard Fricke Department of Physics University of Kassel 34132 Kassel, Germany Tel.: +49 (561) 804-4529 Fax: +49 (561) 804-4136 E-mail: fricke@physik.uni-kassel.de

Stephen L. Dancs, Hon B Sc
Toronto, Canada, Tel./Fax: +1 (416) 963-9624
Comments to author: bf154@torfree.net