Gemini GMOS spectroscopy of HeII nebulae in M 33 C. Kehrig, M. S. Oey, P. A. Crowther, J. Fogel, E. Pellegrini, O. Schnurr, D. Schaerer, P. Massey and K. Roth A&A, 526 (2011) A128 Published online: 11 January 2011 DOI: 10.1051/0004-6361/201015493