V. K. AGARWAL, B. P. SINGH AND. “Effect of Fungicide and Rhizobium Seed Treatment on Nodulation in Soy Bean”. Indian Phytopathology, vol. 43, no. 3, Jan. 2002, pp. 467-9, https://epubs.icar.org.in/index.php/IPPJ/article/view/22631.