Luminosity and mass function of galactic open clusters I. NGC 4815 L. Prisinzano, G. Carraro, G. Piotto, A. F. Seleznev, P. B. Stetson and I. Saviane A&A, 369 3 (2001) 851-861 Published online: 15 April 2001 DOI: 10.1051/0004-6361:20010202