Ahmed Mohamed Al-Doori, S. “Response of Yield, Yield Components and Seed Quality of Some Rapeseed Genotypes (Brassica Napus L.) to Plant Density under Rainfed Conditions”. College of Basic Education Research Journal, vol. 12, no. 4, Dec. 2013, pp. 957-68, https://stats.uomosul.edu.iq/index.php/berj/article/view/38293.