1. Abbott, T. M. C. and Sinclaire, P. 1993 The Messenger 73, 17
2. Beckert, D. C. and Newberry, M. V. 1989 PASP 101, 849
3. Bessell, M. S. 1990 PASP 102, 1181
4. Bessell, M. S. 1993a in Stellar Photometry - Current Techniques and Future Developments, C. J. Butler and I. Elliott, eds., Cambridge University Press, Cambridge, p. 220
5. Bessell, M. S. 1993b in Precision Photometry, D. Kilkenny, E. Lastovica, and J. W. Menzies, eds., South African Astronomical Observatory, Capetown, p. 46