A. Hofmann, “A FRUITFUL FRIENDSHIP BETWEEN AN ETHNOBOTANIST AND A PHYTOCHEMIST”, Rev. Acad. Colomb. Cienc. Ex. Fis. Nat., vol. 16, no. 63, pp. 89–90, Dec. 1988, doi: 10.18257/raccefyn.16(63).1988.3698.