HI observations of loose galaxy groups - I. Data and global properties W. van Driel, P. Marcum, J. S. Gallagher III, E. Wilcots, C. Guidoux and D. Monnier Ragaigne A&A, 378 2 (2001) 370-393 Published online: 15 November 2001 DOI: 10.1051/0004-6361:20011241