Light element abundances in the young open clusters NGC 3293, NGC 4755 and NGC 6231: Tracers of stellar evolutionG. Mathys, S. M. Andrievsky, B. Barbuy, K. Cunha and S. A. KorotinA&A, 387 3 (2002) 890-902DOI: https://doi.org/10.1051/0004-6361:20020412