G.S. SAHARAN, NARESH MEHTA and. “Morphological and Pathological Variations in Peronospora Parasitica Infecting Brassica Species”. Indian Phytopathology, vol. 47, no. 2, Jan. 2002, pp. 153-8, https://epubs.icar.org.in/index.php/IPPJ/article/view/21040.