Star formation in Perseus - Clusters, filaments and the conditions for star formation J. Hatchell, J. S. Richer, G. A. Fuller, C. J. Qualtrough, E. F. Ladd and C. J. Chandler A&A, 440 1 (2005) 151-161 Published online: 19 August 2005 DOI: 10.1051/0004-6361:20041836