Y. S. AHLAWAT and P. RAMACHANDRAN, D.K. GHOSH, S. MATHUR, K. N. GUPTA,. 2002. “Viroid Infection of Citrus in Central India”. Indian Phytopathology 55 (3): 290-93. https://epubs.icar.org.in/index.php/IPPJ/article/view/18731.