Where is the neutral atomic gas in Hickson groups? L. Verdes-Montenegro, M. S. Yun, B. A. Williams, W. K. Huchtmeier, A. Del Olmo and J. Perea A&A, 377 3 (2001) 812-826 Published online: 15 October 2001 DOI: 10.1051/0004-6361:20011127