Y R SARMA, J. A. M. A. K. V. R. “A Simple Method for Indexing Phytophthora and Nematode Infections in Black Pepper (Piper Nigrum L.)”. Journal of Spices and Aromatic Crops, vol. 5, no. 1, June 1996, pp. 68-71, https://updatepublishing.com/journal/index.php/josac/article/view/4375.