Affiliation: | aDepartment of Mathematics, University of Kentucky, Lexington, KY 40506-0027, USA bDipartimento di Architettura e Pianificazione, Università di Sassari, 07041 Alghero (SS), Italy cDepartment of Chemical and Materials Engineering, University of Kentucky, Lexington, KY 40506-0046, USA dMetals and Ceramics Division, Oak Ridge National Laboratory, P.O. Box 2008, MS-6064, Oak Ridge, TN 37831-6064, USA |