TY - JOUR AU - Peter Conti BT - The Astrophysical Journal DA - Jan-02-1974 DO - 10.1086/152664 PY - 1974 EP - 539 T2 - The Astrophysical Journal TI - Spectroscopic studies of O-type stars. IV. Lines in the red region UR - http://adsabs.harvard.edu/full/1974ApJ...187..539C VL - 187 SN - 0004-637X ER -