Authors
Diletta Burini
Dipartimento di Matematica, Universita di Perugia,, Perugia, Italy
Elena De Angelis
Dipartimento di Scienze Matematiche \Giuseppe Luigi Lagrange", Politecnico di Torino,, Torino, Italy
Miroslaw Lachowicz
Institute of Applied Mathematics and Mechanics, Faculty of Mathematics, Informatics and Mechanics, University of Warsaw,, Warsaw, Poland