Affiliation: | 1.Civil and Industrial Engineering, University of Pisa, Largo Lucio Lazzarino 2, 56122, Pisa, Italy ;2.National Group for Mathematical Physics, Pisa, Italy ;3.Structural and Geotechnical Engineering, University “La Sapienza”, Via Eudossiana 18, 00184, Rome, Italy ;4.National Group for Mathematical Physics, Rome, Italy ; |