Ken Yasukawa, So Yeon Yu, Shigetoshi Tsutsumi, Masahiko Kurokawa and Yong K. Park 2012. Inhibitory Effects of Brazilian Propolis on Tumor Promotion in Two-Stage Mouse Skin Carcinogenesis. Journal of Pharmacy and Nutrition Sciences . 2, 1 (Jan. 2012), 71–76. DOI:https://doi.org/10.6000/1927-5951.2012.02.01.10.