1. A. Arellano-Ferro, S. Giridhar, and P. Mathias, Astron. Astrophys. 368, 250 (2001).
2. V. P. Arkhipova, R. I. Noskova, N. P. Ikonnikova, and G.V. Komissarova, Pis’maAstron. Zh. 29, 545 (2003) [Astron. Lett. 29, 480 (2003)].
3. V. P. Arkhipova, V. F. Esipov, N. P. Ikonnikova et al., Pis’ma Astron. Zh. 35, 846 (2009a) [Astron. Lett. 35, 764 (2009)].
4. V. P. Arkhipova, N. P. Ikonnikova, and G. V. Komissarova, Variable Stars, No. 1 (2009b).
5. V. V. Bobylev, Pis’ma Astron. Zh. 36, 667 (2010) [Astron. Lett. 36, 634 (2010)].