Water vapour masers in long-period variable stars - I. RX Bootis and SV Pegasi A. Winnberg, D. Engels, J. Brand, L. Baldacci and C. M. Walmsley A&A, 482 3 (2008) 831-848 Published online: 04 March 2008 DOI: 10.1051/0004-6361:20078295