Rocha, D., J. A. Takahashi, and M. A. D. Boaventura. “Di- and Tri-Hydroxylated Kaurane Derivatives from Microbial Transformation of Ent-Kaur-16-En-19-Ol by Cephalosporium Aphidicola and Their Allelopathic Activity on Lactuca Sativa (Lettuce)”. Eclética Química, vol. 34, no. 1, Mar. 2009, pp. 57-62, doi:10.26850/1678-4618eqj.v34.1.2009.p57-62.