MGBEJE, B.; UMOH, E.; EMMANUEL-IKPEME, C. Comparative Analysis of Phytochemical Composition of Four Selected Tropical Medicinal Plants Namely: Ocimum gratissimum, Piper guineense, Gongronema latifolium and Vernonia amygdalina. Journal of Complementary and Alternative Medical Research, v. 7, n. 3, p. 1-11, 25 jun. 2019.