Metallicity and mean age across m,33

Cioni, M. R. L., Irwin, M., Ferguson, A. M. N., McConnachie, A., Conn, B. C., Huxor, A., … Tanvir, N. (2008). Metallicity and mean age across m,33. In Astrophysics and Space Science Proceedings (Vol. 0, pp. 255–258). Springer Science and Business Media B.V. https://doi.org/10.1007/978-1-4020-6933-8_57