Excitability following an avalanche-collapse process F. Plaza, M. G. Velarde, F. T. Arecchi, S. Boccaletti, M. Ciofini and R. Meucci Europhys. Lett., 38 2 (1997) 85-90 Published online: 01 September 2002 DOI: 10.1209/epl/i1997-00205-7