Correlation of Total Phenolic, Flavonoid and Tannin Content of Bryophyllum pinnatum (Lam.) (Crassulaceae) Extract with the Antioxidant and Anticholinesterase Activities, Elufioye, Taiwo O., Olusola Damilare M., and Oyedeji Adebola O. , Pharmacognosy Journal, September 2019, Volume 11, Issue 5, p.1003-1009, (2019)