Article ISI
ApJ  (2007)

The Spitzer c2d Survey of Weak-Line T Tauri Stars. II. New Constraints on the Timescale for Planet Building

Cieza, Lucas; Padgett, Deborah L.; Stapelfeldt, Karl R.; Augereau, Jean-Charles; Harvey, Paul; Evans, Neal J., II; Merín, Bruno; Koerner, David; Sargent, Anneila; van Dishoeck, Ewine F.; et al.