V, I CCD photometry of metal-rich bulge globular clusters: NGC 6553 R. Sagar, A. Subramaniam, T. Richtler and E. K. Grebel Astron. Astrophys. Suppl. Ser., 135 3 (1999) 391-404 Published online: 15 March 1999 DOI: 10.1051/aas:1999181