Sensitive survey for 13CO, CN, H2CO, and SO in the disks of T Tauri and Herbig Ae stars - II. Stars in ρ Ophiuchi and upper ScorpiusL. Reboussin, S. Guilloteau, M. Simon, N. Grosso, V. Wakelam, E. Di Folco, A. Dutrey and V. PiétuA&A, 578 (2015) A31DOI: https://doi.org/10.1051/0004-6361/201525705