Searching for gas-rich disks around T Tauri stars in Lupus T. A. van Kempen, E. F. van Dishoeck, C. Brinch and M. R. Hogerheijde A&A, 461 3 (2007) 983-990 Published online: 12 September 2006 DOI: 10.1051/0004-6361:20065174