AND B. P. SINGH, J. K. JOHRI, K. M. SRIVASTAVA, R. K. RAIZADA, A. L. DESHPANDE*. 2002. “ISOLATION AND PURIFICATION OF A VIRUS INFECTING PIPER BETLE”. Indian Phytopathology 43 (4): 491-95. https://epubs.icar.org.in/index.php/IPPJ/article/view/22648.