Extended optical spectroscopic monitoring of wind structure in HD 152408 R. K. Prinja, O. Stahl, A. Kaufer, S. R. Colley, P. A. Crowther and B. Wolf A&A, 367 3 (2001) 891-909 Published online: 15 March 2001 DOI: 10.1051/0004-6361:20000532