K.S. DERRICK and Y.S. AHLAWAT, SHELLY PRAVEEN, GARY A. BARTHE*,. “Comparison of Isolates of Indian Citrus Ring Spot Virus and Citrus Psorosis Virus”. Indian Phytopathology, vol. 56, no. 2, June 2003, pp. 230-2, https://epubs.icar.org.in/index.php/IPPJ/article/view/18323.