1. Arevalo, M.J., Lazaro, C.: Inf. Bull. Var. Stars 5304 (2002)
2. Cao, L., Ruan, P., Cai, H.-B., Deng, J.-S., Hu, J.-Y., Jiang, X.-J., Liu, Z.-H., Qiu, Y.-L., Wang, J., Wang, S., Yang, J.-F., Zhao, F., Wei, J.-Y.: Sci. China 54, 558 (2011)
3. Cester, B.: Mem. Soc. Astron. Ital. 30, 287 (1959)
4. Cox, A.N.: Allen’s Astrophysical Quantities, 4th edn. Springer/AIP Press, New York (2000)
5. Deǧirmenci, Ö.L., Gülmen, O., Sezer, C., Erdem, A., Devlen, A.: Astron. Astrophys. 363, 244 (2000)