LTE spectrum synthesis in magnetic stellar atmospheres - The interagreement of three independent polarised radiative transfer codesG. A. Wade, S. Bagnulo, O. Kochukhov, J. D. Landstreet, N. Piskunov and M. J. StiftA&A, 374 1 (2001) 265-279DOI: https://doi.org/10.1051/0004-6361:20010735