Antioxidant Activity of DPPH, CUPRAC, and FRAP Methods, as well as Activity of Alpha-Glucosidase Inhibiting Enzymes from Tinospora crispa (L.) Stem Ultrasonic Extract, Irawan, Candra, Putri Imalia Dwi, Sukiman Maman, Utami Andita,, Putri Ratna Komala, Lisandi Anisa, and Pratama Andrean Nur , Pharmacognosy Journal, October 2022, Volume 14, Issue 5, p.511-520, (2022)