S.M. PURUSHOTHAMAN, N. RAMACHANDRAN, VEENA and. “Peronospora Sparsa - a New Disease on Field Grown Roses”. Indian Phytopathology, vol. 56, no. 2, June 2003, p. 236, https://epubs.icar.org.in/index.php/IPPJ/article/view/18326.