1. Budding, E.: An Introduction to Astronomical Photometry. Cambridge University Press, Cambridge (1993), p. 199
2. Christensen, R.: Analysis of Variance, Design and Regression. Chapman and Hall/CRC Press, London (1996), p. 521
3. Curtis, H.D.: Publ. Astron. Soc. Pac. 20, 133 (1908)
4. Han, Z., Tout, C.A., Eggleton, P.P.: Mon. Not. Roy. Astron. Soc. 319, 215 (2000)
5. Hill, G., Hilditch, R.W., Aikman, G.C.L., Khalesseh, B.: Astron. Astrophys. 282, 455 (1994)