Analgesic effect of aqueous and hydroalcoholic extracts of three Congolese medicinal plants: Hyptis suavolens, Nauclea latifolia and Ocimum gratissimum - Okiemy-Anissa, N; Miguel, M L; Etou, A W; Ouamba, J M; Gbeassor, M; Abena, A A (Pak J Biol Sci, 2004)