Spectral types and masses of white dwarfs in globular clusters S. Moehler, D. Koester, M. Zoccali, F. R. Ferraro, U. Heber, R. Napiwotzki and A. Renzini A&A, 420 2 (2004) 515-525 Published online: 28 May 2004 DOI: 10.1051/0004-6361:20035819