Spectroscopic monitoring of the luminous blue variable Westerlund1-243 from 2002 to 2009B. W. Ritchie, J. S. Clark, I. Negueruela and F. NajarroA&A, 507 3 (2009) 1597-1611DOI: https://doi.org/10.1051/0004-6361/200912986
