The formation of broad emission line regions in supernova-QSO wind interactions J. M. Pittard, J. E. Dyson, S. A. E. G. Falle and T. W. Hartquist A&A, 375 3 (2001) 827-839 Published online: 15 September 2001 DOI: 10.1051/0004-6361:20010906