Affiliation: | (1) Institut de Recherche en Mathématiques et Informatique Appliquées, Université de La Réunion, Saint-Denis, Ile de La Réunion, France;(2) Department of Mathematics, University of Jyväskylä, Jyväskylä, Finland;(3) Department of Civil Engineering, Aristotle University, Thessaloniki, Greece;;(4) Faculty of Mathematics and Physics, RWTH, Aachen, Germany |