1. UBVRI passbands
2. Bessell, M. S. 1992, in IAU Colloq. 136, Stellar Photometry-Current Techniques and Future Developments, ed. C. J. Butler & I. Elliott (Cambridge: Cambridge Univ. Press), 22
3. Bessell, M. S. & Castelli, F. 2000, A&A, in preparation