Dagne, E., Bekele, T., Bisrat, D., Alemayehu, M., Worku, T. and Elokaokich, J. P. (2004) “Essential oils of resins from three<i> Pinus</i> species growing in Ethiopia and Uganda”, SINET: Ethiopian Journal of Science, 22(2), pp. 253–257. doi: 10.4314/sinet.v22i2.18146.