Affiliation: | 1. LAMDA-RO Laboratory, Department of Mathematics, University of Blida, B.P. 270, Blida, Algeria 2. Department of Mathematics, East Tennessee State University, Johnson City, TN, 37614, USA 3. Department of Mathematics, University of Johannesburg, Auckland Park, South Africa 4. School of Computing, Clemson University, Clemson, SC, 29634, USA 5. Professor Emeritus, School of Computing, Clemson University, Clemson, SC, 29634, USA 6. Computer Science Department, Appalachian State University, Boone, NC, 28608-2133, USA
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