An optical/NIR survey of globular clusters in early-type galaxies - II. Ages of globular cluster systems and the relation to galaxy morphologyA. L. Chies-Santos, S. S. Larsen, H. Kuntschner, P. Anders, E. M. Wehner, J. Strader, J. P. Brodie and J. F. C. SantosA&A, 525 (2011) A20DOI: https://doi.org/10.1051/0004-6361/201015683