C. Homkhiew, W. Boonchouytan, W. Cheewawuttipong, L. Buppapo, P. Auttagornsakun, and T. Ratanawilai, “Effects of extruding factors on mechanical and physical properties of polypropylene/rubberwood flour composites”, Eng Appl Sci Res, vol. 45, no. 2, pp. 120–126, May 2018.