The Red Giant Branch luminosity function bumpM. Riello, S. Cassisi, G. Piotto, A. Recio-Blanco, F. De Angeli, M. Salaris, A. Pietrinferni, G. Bono and M. ZoccaliA&A, 410 2 (2003) 553-563DOI: https://doi.org/10.1051/0004-6361:20031272