TY - JOUR T1 - MSX mid-infrared imaging of massive star birth environments -- I. Ultracompact H II regions JO - Monthly Notices of the Royal Astronomical Society PY - 2003/07/21 AU - Crowther PA AU - Conti PS ED - DO - DOI: 10.1046/j.1365-8711.2003.06646.x PB - Oxford University Press (OUP) VL - 343 IS - 1 SP - 143 EP - 163 Y2 - 2024/12/22 ER -