- Unnikrishnan, Gayathri., et all. "Evaluation of lignin waste as potential carriers for phosphate solubilizing bio-fertilizers: A zero waste technology." International Journal of Recycling of Organic Waste in Agriculture, vol. 10, no. 4, pp. 331 - 351, https://doi.org/10.30486/ijrowa.2021.1910757.1141