Abundant molecular gas in tidal dwarf galaxies: On-going galaxy formation J. Braine, P.-A. Duc, U. Lisenfeld, V. Charmandaris, O. Vallejo, S. Leon and E. Brinks A&A, 378 1 (2001) 51-69 Published online: 15 October 2001 DOI: 10.1051/0004-6361:20011109