Lai ZR, Ho YL, Huang SC, Huang TH, Lai SC, Tsai JC, Wang CY, Huang GJ, Chang YS. Antioxidant, anti-inflammatory and antiproliferative activities of Kalanchoe gracilis (L.) DC stem. Am J Chin Med. 2011;39(6):1275–90. doi: 10.1142/s0192415x1100955x. PMID: 22083996.