S.S. CHAHAL, P.P.S. PANNU and. “Variability in Tilletia Indica, the Incitant of Karnal Bunt of Wheat”. Indian Phytopathology, vol. 53, no. 3, June 2002, pp. 279-82, https://epubs.icar.org.in/index.php/IPPJ/article/view/19313.