Near-infra-red spectroscopic ages of massive star clusters in M 82A. Lançon, J. S. Gallagher, M. Mouhcine, L. J. Smith, D. Ladjal and R. de GrijsA&A, 486 1 (2008) 165-176DOI: https://doi.org/10.1051/0004-6361:200809439