TY - JOUR AU - J. Puls AU - David Hummer BT - Astronomy and Astrophysics DA - 02/1988 N1 - JILA Pub. 3560 PY - 1988 SP - 87 EP - 98 T2 - Astronomy and Astrophysics TI - The Sobolev approximation for the line force and line source function in a spherically-symmetrical stellar wind with continuum opacity UR - http://adsabs.harvard.edu/full/1988A\%26A...191...87P VL - 191 ER -