AGB stars as tracers of metallicity and mean age across M 33M.-R. L. Cioni, M. Irwin, A. M. N. Ferguson, A. McConnachie, B. C. Conn, A. Huxor, R. Ibata, G. Lewis and N. TanvirA&A, 500 3 (2009) 1025DOI: https://doi.org/10.1051/0004-6361/200809366e
