Chen, F., Al-Ahmad, H., Joyce, B., Zhao, N., Köllner, T. G., Degenhardt, J., & Stewart Jr., C. (2009). Within-plant distribution and emission of sesquiterpenes from Copaifera officinalis. Plant Physiology and Biochemistry, 47(11-12), 1017-1023. doi:10.1016/j.plaphy.2009.07.005.