Structural characterization of lignin from triploid of Populus tomentosa Carr Yuan, T.-Q.; Sun, S.-N.; Xu, F.; Sun, R.-C. Journal of Agricultural and Food Chemistry 59(12): 6605-6615 2011 0021-8561 10.1021/jf2003865 https://eurekamag.com/research/055/950/055950225.php