Photometric validation of a model independent procedure to extract galaxy clusters E. Puddu, S. Andreon, G. Longo, V. Strazzullo, M. Paolillo and R. R. Gal A&A, 379 2 (2001) 426-435 Published online: 15 November 2001 DOI: 10.1051/0004-6361:20011316