Affiliation: | 1. Dipartimento di Ingegneria Civile, Università di Udine, Via delle Scienze 208, 33100, Udine, Italy 2. School of Mathematical Sciences, University of KwaZulu–Natal, Durban, 4041, South Africa 3. Laboratoire de Mathématiques, CNRS UMR 6620, Université Blaise Pascal (Clermont-Ferrand 2), 63177, Aubière Cedex, France
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