Abundant molecular gas in the intergalactic medium of Stephan's Quintet U. Lisenfeld, J. Braine, P.-A. Duc, S. Leon, V. Charmandaris and E. Brinks A&A, 394 3 (2002) 823-833 Published online: 21 October 2002 DOI: 10.1051/0004-6361:20021232