%0 Journal Article %T Problems and possibilities in fine-tuning of the Cepheid P-L relationship %A L. Szabados %A P. Klagyivik %J Physics %D 2012 %I arXiv %R 10.1007/s10509-012-0988-7 %X Factors contributing to the scatter around the ridge-line period-luminosity relationship are listed, followed by a discussion how to eliminate the adverse effects of these factors (mode of pulsation, crossing number, temperature range, reddening, binarity, metallicity, non-linearity of the relationship, blending), in order to reduce the dispersion of the P-L relationship. %U http://arxiv.org/abs/1201.1991v1