1. Caffeine and related methylxanthines: possible naturally occurring pesticides;Nathanson, J.A.;Science,1984
2. Flowering plants of the world;Heywood, V.H.,1978
3. Diapensiaceae to myoporaceae;Europea, Tutin TGFlora; 3,1972
4. The use of remedies in diseases of the heart and blood vessels;Brunton, T.L.;JAMA
5. A survey of cardiac glycosides and genins;Hoch, J.H.,1961