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, Erica was about to be a senior at Birmingham-Southern College where she graduated in 1993. Currently she is in graduate school at Ohio State University.
Gerard A. Venema - Department of Mathematics and Statistics
Calvin College, Grand Rapids, MI