Affiliation: | (1) Department of Pure Mathematics, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1 (Fax: 519/725-0160, e-mail: dragomir@herod.uwaterloo.ca), CA;(2) Department of Mathematics and Statistics, McMaster University, Hamilton, Ontario, Canada L8S 4K1 (Fax: 905/522-0935, e-mail: nguyen@icarus.math.mcmaster.ca), CA |