Farahani, H. A., and B. Aref. 2009. “EFFECT OF PLANT DENSITY ON OIL YIELD OF CASTOR (RICINUS COMMUNIS L) IN APPLICATION OF NITROGEN LEVELS CONDITIONS”. African Journal of Traditional, Complementary and Alternative Medicines 6 (April):336. https://journals.athmsi.org/index.php/ajtcam/article/view/673.