Bhattarai, Shiva, Sunil Aryal, and Resham Thapa. 2015. “The Capacity of Lignin to Enhance the Phthorimaea Opercullela Granulovirus (PhopGV) Stability in Laboratory Condition”. International Journal of Applied Sciences and Biotechnology 3 (2), 256-60. https://doi.org/10.3126/ijasbt.v3i2.12481.