Onokoko, P., Vanhaelen, M., Vanhaelenfastre, R., Declercq, J.-P., & Vanmeerssche, M. (1985). The Constitution of Icacinol, a New Diterpene With a Pimarane Skeleton From Icacina-claessensis. Tetrahedron, 41(4), 745-748. https://doi.org/10.1016/S0040-4020(01)96452-X (Original work published 1985)