The stellar clocks of galaxies - Commentary on: Bertelli G., Bressan A., Chiosi C., et al., 1994, A&AS, 106, 275; Girardi L., Bressan A., Bertelli G., Chiosi C., 2000, A&A, 141, 371
A&A, 500 1 (2009) 457-458
DOI: https://doi.org/10.1051/0004-6361/200912194