1. Al-Naimiy, H. M. K.: 1978,Astrophys. Space Sci. 53, 181.
2. Banks, T.: 1989,Southern Stars 22, 188.
3. Bevington, P. R.: 1969,Data Reduction and Error Analysis for the Physical Sciences, McGraw-Hill, New York.
4. Brancewicz, H. K. and Dworak, T. Z.: 1980,Acta Astron. 30, 501.
5. Budding, E.: 1984,Catalogue of Classical Algol-Type Binary Candidate Stars C. D. S. Information Bulletin 27, 91.