TY - JOUR T1 - On the central ionizing star of G23.96+0.15 and near-IR spectral classification of O stars JO - ASTRON ASTROPHYS PY - 2008/12/01 AU - Crowther PA AU - Furness JP ED - DO - DOI: 10.1051/0004-6361:200810942 VL - 492 IS - 1 SP - 111 EP - 115 Y2 - 2024/12/23 ER -