In vitro Antioxidant Properties and ?-Glucosidase Inhibition of Combined Leaf Infusions from Psidium guajava L., Syzygium polyanthum L., and Annona muricata L., Rahayu, Ika, Heng Pamela Hendra, and Timotius Kris H. , Pharmacognosy Journal, October 2019, Volume 11, Issue 6, p.1269-1277, (2019)