1. Akim Adekpedjou is a Professor, Department of Mathematics and Statistics, Missouri University of Science and Technology, 400 W. 12th St., Rolla, MO 65409, USA. Huybrechts F. Bindele is an Associate Professor, Department of Mathematics and Statistics, University of South Alabama, 411 University Blvd. N, MSPB 316, Mobile, AL 36688, USA