Integrated spectral analysis of 18 concentrated star clusters in the Small Magellanic CloudA. E. Piatti, J. F. C. Santos, J. J. Clariá, E. Bica, A. V. Ahumada and M. C. ParisiA&A, 440 1 (2005) 111-120DOI: https://doi.org/10.1051/0004-6361:20052982