Star formation in Perseus - II. SEDs, classification, and lifetimes J. Hatchell, G. A. Fuller, J. S. Richer, T. J. Harries and E. F. Ladd A&A, 468 3 (2007) 1009-1024 Published online: 11 April 2007 DOI: 10.1051/0004-6361:20066466