12C/13C of Kepler giant stars: The missing piece of the mixing puzzleN. Lagarde, R. Minkevičiūtė, A. Drazdauskas, G. Tautvaišienė, C. Charbonnel, C. Reylé, A. Miglio, T. Kushwahaa and B. BaleA&A, 684 (2024) A70DOI: https://doi.org/10.1051/0004-6361/202348336