Rastegarfar, Nahid, et al. “Preparation and Optimization of Bio-Polyols from Sawdust Liquefaction Using Crude Glycerol and Polyethylene Glycol”. BioResources, vol. 21, no. 4, Aug. 2026, pp. 9473-91, https://ojs.bioresources.com/index.php/BRJ/article/view/25986.