Near-infrared spectroscopy of AGB star candidates in Fornax, Sculptor, and NGC 6822 M. A. T. Groenewegen, A. Lançon and M. Marescaux A&A, 504 3 (2009) 1031-1040 Published online: 24 July 2009 DOI: 10.1051/0004-6361/200911675