Abd-Ella, A. A., Y. A. Abdel-Rahman, G. H. Abou-Elhagag, and A. S. Gaber. “Population Fluctuations of Oystershell Scale Insect, Lepidosaphes Ulmi (L.) (Homoptera: Diaspididae) on Certain Olive Varieties and the Factors Affecting Its Population”. Journal of Phytopathology and Disease Management, vol. 7, no. 1, Apr. 2020, pp. 43-53, https://ppmj.net/index.php/ppmj/article/view/196.