CCD photometry of the Globular Cluster NGC 6093
  In this paper we present photometric CCD observations of the globular cluster NGC 6093 (M80) in filters B, V , R and I. We produce the colour-magnitude diagrams for this object and obtain values for its metallicity [Fe/H], reddening E(V-B), E(V-I) and distance modulus (m - M)_0. 
A. Ruelas-Mayorga, L. J. Sanchez, C. A. Bernal-Herrera, A.   Nigoche-Netro, J. Echevarria and A. M. Garcia
astro-ph.SR astro-ph.GA