The Solar Twin Planet Search - III. The [Y/Mg] clock: estimating stellar ages of solar-type starsM. Tucci Maia, I. Ramírez, J. Meléndez, M. Bedell, J. L. Bean and M. AsplundA&A, 590 (2016) A32DOI: https://doi.org/10.1051/0004-6361/201527848