Waris, M., I. ul Haq, S. A. Khan, M. Iqbal, M. Shoaib, and Z. Ullah. “SCREENING OF CUCUMBER VARIETIES AGAINST DOWNY MILDEW (PSEUDOPERONOSPORA CUBENSIS) AND ITS CHEMICAL MANAGEMENT”. Pakistan Journal of Phytopathology, vol. 26, no. 1, June 2014, pp. 21-24, http://www.pjp.pakps.com/index.php/PJP/article/view/77.