Deriving effective sunspot temperatures from SOHO/VIRGO irradiance measurements - A starspot modelling approachZ. Eker, P. N. Brandt, A. Hanslmeier, W. Otruba and C. WehrliA&A, 404 3 (2003) 1107-1115DOI: https://doi.org/10.1051/0004-6361:20030573
