1. Part XVIII. , , , and , J. Essent. Oil Res., in press.
2. and . Flore et Médecine Traditionnelle, Mission d'Etude 1978 au Rwanda. L—Observations Floristiques, Rapport ACCT, 3rd edn, p. 125, Paris (1981).
3. and , Flora of West Tropical Africa, 2nd edn, Vol 2, p. 450, F. N. Hepper, London (1963).
4. , , , , , , , , , , , , , and , Contribution aux Etudes Ethnobotaniques et Floristiques en République Populaire du Congo, Rapport ACCT, p. 221, Paris (1988).
5. Unusual rearranged abietanoic diterpenoids from Solenostemon species