Friday, O. N., & Muhammad, M. M. (2016). Isolation and Physicochemical Characterization of Lignin from <i>Chromolaena Odorata</i> and <i>Tithonia Diversifolia</i>. Journal of Applied Sciences and Environmental Management, 19(4), 787–792. https://doi.org/10.4314/jasem.v19i4.28