Bowen excitation of N III lines in symbiotic stars M. Eriksson, S. Johansson, G. M. Wahlgren, H. Veenhuizen, U. Munari and A. Siviero A&A, 434 2 (2005) 397-404 Published online: 11 April 2005 DOI: 10.1051/0004-6361:20042174