The empirical metallicity dependence of the mass-loss rate of O- and early B-type starsM. R. Mokiem, A. de Koter, J. S. Vink, J. Puls, C. J. Evans, S. J. Smartt, P. A. Crowther, A. Herrero, N. Langer, D. J. Lennon, F. Najarro and M. R. VillamarizA&A, 473 2 (2007) 603-614DOI: https://doi.org/10.1051/0004-6361:20077545