R. F. Raffauf and A. Higurashi, “NOTES ON THE TOXICITY OF Sphenoclea zeylanica”, Rev. Acad. Colomb. Cienc. Ex. Fis. Nat., vol. 16, no. 63, pp. 99–105, Dec. 1988, doi: 10.18257/raccefyn.16(63).1988.3701.