CCD photometry of metal-rich globular clusters: NGC 6528 T. Richtler, E. K. Grebel, A. Subramaniam and R. Sagar Astron. Astrophys. Suppl. Ser., 127 2 (1998) 167-179 Published online: 15 January 1998 DOI: 10.1051/aas:1998341