1. Abhyankar, K. D.: 1983, in K. D. Abhyankar and G. M. Ballabh (eds.), ?Binary and Multiple Systems?,Symp. Proc., p. 1.
2. Arganbright, D. V., Osborn, W., and Hall, D. S.: 1988,Inf. Bull. Var. Stars, No. 3224.
3. Breger, M.: 1990,Comm. Astroseismology, No. 20.
4. Chambliss, C. R.: 1976,Publ. Astron. Soc. Pacific 88, 22.
5. Deeming, T. J.: 1975,Astrophys. Space Sci. 36, 137.