Popowski, P. Cosmology, MPI for Astrophysics, Max Planck Society;
Kunder, A. M., Chaboyer, B., Popowski, P., Nikolaev, S., & Cook, K. H. (2005). The metallicity of MACHO galactic bulge RR0 Lyrae stars from Fourier coefficients of light curves. In C. Sterken, & C. Aerts (Eds.), Astrophysics of Variable Stars (pp. 273-276). San Francisco, CA, USA: Astronomical Society of the Pacific.