Topçu, G., Altıner, E.N., Gözcü, S., Halfon, B., Aydoğmuş, Z., Pezzuto, J.M., Zhou, B.N., Kingston, D.G.I., “Studies on Di and Triterpenoids from Salvia Staminea with Cytotoxic Activity”, Planta Medica, 69, 5, 464-467, 2003.