Antiosteoporosis Effects of 70% Ethanolic Extract Combination of Dayak Onion Bulbs (Eleutherine bulbosa (Mill.) Urb) and Cowpea (Vigna unguiculata (L.) Walp.) on the Hypoestrogen Rats, Bahtiar, Anton, and Dewi Renita , Pharmacognosy Journal, July 2019, Volume 11, Issue 4, p.632-638, (2019)