Jeff Boersema and Erica (Taylor) Whitaker wrote this paper during the summer of
1992 during an NSF-sponsored Research Experiences for Undergraduates
program at Calvin and Hope Colleges under the supervision of Dr. Gerard
Venema. At the time, Jeff was about to be a senior at Calvin College. He is now on the faculty at Seattle University.
Gerard A. Venema - Department of Mathematics and Statistics
Calvin College, Grand Rapids, MI