Georgiev, Kaloyan D., Iliya J. Slavov, and Ivan A. Iliev. 2019. “In Vitro Evaluation of Combination Effects of Doxorubicin With Methylxanthine Fractions Isolated from Bancha and Pu-Erh Teas Against Breast Cancer Cells”. International Journal of Basic & Clinical Pharmacology 8 (10):2167-71. https://doi.org/10.18203/2319-2003.ijbcp20194254.