Ultra-luminous X-ray sources and remnants of massive metal-poor stars

Mapelli Michela, Ripamonti Emanuele, Zampieri Luca, Colpi Monica, Bressan Alessandro, Ultra-luminous X-ray sources and remnants of massive metal-poor stars, 2010, MNRAS, 408, 234, http://ui.adsabs.harvard.edu/abs/2010MNRAS.408..234M