Warm SiO gas in molecular bullets associated with protostellar outflows B. Nisini, C. Codella, T. Giannini, J. Santiago Garcia, J. S. Richer, R. Bachiller and M. Tafalla A&A, 462 1 (2007) 163-172 Published online: 11 October 2006 DOI: 10.1051/0004-6361:20065621