References
- Willaman J. J., Schubert B. G. Alkaloid-bearing plants and their contained alkaloids. 1961, Technical Bull. No. 1234, ARS, U.S.D.A., Washington, D.C
- Willaman J. J., Li H. L. Alkaloid-bearing plants and their contained alkaloids 1957–1968. Lloydia 1970; 33, Supplement 3A
- Fong H. H. S., Trojankova M., Trojanek J., Farnsworth N. R. Alkaloid screening II. Lloydia 1972; 35: 117
- Smolenski S. J., Silinis H., Farnsworth N. R. Alkaloid screening IV. Lloydia 1974; 37: 30
- , Idem 1974. V. ibid 37: 506
- , Idem. 1975. VI. ibid 38: 225
- , Idem 1975. VII. ibid. 38: 411
- , Idem. 1975. VIII. ibid. 38: 497
- , Schultes R. E. 1972, In Prologue of Flora Toxica de Panamá, Editorial Universitaria Panamá, pp. 7–8