Study of the Effect of Lampeni (Ardisia humilis Vahl.) Planting Condition toward the Alpha-glucosidase Inhibition Activity in vitro, Ningsih, Sri, Juniarti Fifit, Rosidah Idah, Fajriawan Adam Arditya, Agustini Kurnia, Rosmalawati Syofi, Wibowo Agung Eru, Sasikirana Erliana, and Sumaryono Wahono , Pharmacognosy Journal, March 2020, Volume 12, Issue 2, p.377-385, (2020)