TY - JOUR T1 - Environments of massive stars and the upper mass limit JO - Proceedings of the International Astronomical Union PY - 2011/01/01 AU - Crowther PA ED - DO - DOI: 10.1017/S1743921312012616 VL - 7 IS - S279 SP - 9 EP - 17 Y2 - 2024/12/22 ER -