Dynamical phenomena at surfaces, interfaces and superlattices : proceedings of an international summer school at the Ettore Majorana Centre, Erice, Italy July 1-13, 1984 ; editors F.Nizzoli, K.H.Rieder and R.F.Willis. - Nizzoli, F; Rieder, K.H; Willis, R. F (Springer series in surface sciences ; ;, 1985)