Casali, G., Magrini, L., Tognelli, E., Jackson, R., Jeffries, R., Lagarde, N., …Bayo, A. (2019). The Gaia-ESO survey: Calibrating the relationship between Age and the [C/N] abundance ratio with open clusters. Astronomy & Astrophysics, 629, Article A62. https://doi.org/10.1051/0004-6361/201935282