TY - JOUR AU - P. Crowther AU - Peter Conti BT - Monthly Notices of the Royal Astronomical Society DA - Sep-07-2004 DO - 10.1046/j.1365-8711.2003.06646.x PY - 2003 SP - 143 EP - 163 T2 - Monthly Notices of the Royal Astronomical Society TI - MSX mid-infrared imaging of massive star birth environments — I. Ultracompact H II regions VL - 343 SN - 0035-8711 ER -