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(. M. Catalisano, . Dipartimento-di-ingegneria-meccanica, G. Energetica, and . Dei-trasporti, E-mail address: catalisano@diptem.unige.it (L. Chiantini) Dipartimento di Ingegneria dell'Informazione e Scienze Matematiche, Università di Siena, Italy. E-mail address: luca.chiantini@unisi.it (A.V. Geramita) Department of Mathematics and Statistics, Queen's University, E-mail address: Anthony.Geramita@gmail.com, geramita@dima.unige.it (A. Oneto) Inria Sophia Antipolis Méditerranée