Deng, Yu, Anmin Wang, Zhu Tao, Yingjie Chen, Xinmei Pan, and Xiangnan Hu. 2014. “An Economical and Facile Method to Synthesize Vildagliptin”. Asian Journal of Chemistry 26 (18):6275-78. https://doi.org/10.14233/ajchem.2014.17621.