LI, SHUO, CHUN-FANG ZHAO, LONG-JIANG YU, ZE-QIANG WU, and YIN XIONG. 2010. “Synthesis of Anhydrovinblastine by Response Surface Methodology”. Asian Journal of Chemistry 20 (3):2373-80. https://asianpubs.org/index.php/ajchem/article/view/19274.