Wave propagation and localisation in nonlocal and gradient-enhanced damage models R.H.J. Peerlings, R. de Borst, W.A.M. Brekelmans et M.G.D. Geers J. Phys. IV France, 08 PR8 (1998) Pr8-293-Pr8-300 DOI: 10.1051/jp4:1998836