TY - JOUR T1 - Ionizing power of massive stars in the cores of two giant HII regions: R136A and HD 97950 JO - Astrophysics and Space Science PY - 1998/12/01 AU - Dessart L AU - Crowther P ED - VL - 260 IS - 1-2 SP - 177 EP - 180 Y2 - 2024/12/22 ER -