Nagpurkar, L.P., et al. “Formation of Industrially Important Chemicals from Thermal and Microwave Assisted Oxidative Degradation of Industrial Waste Lignin ”. Asian Journal of Chemistry, vol. 14, no. 3, Mar. 2010, pp. 1387-92, https://asianpubs.org/index.php/ajchem/article/view/22410.