Self–propelled soliton collisions in a semiconductor Cavity Soliton Laser G. Tissoni, K.M. Aghdami, M. Brambilla and F. Prati Eur. Phys. J. Special Topics, 203 (2012) 193-205 Published online: 11 April 2012 DOI: 10.1140/epjst/e2012-01543-1