Beshah, B., A. Mitiku, M. Chernet, M. Assefa, and M. Addisu. “Mechanical Property of Plastic Lumber Produced from Recycled High Density Polyethylene (HDPE)”. Journal of Science, Technology and Arts Research, vol. 3, no. 1, Mar. 2014, pp. 141-4, https://journals.wgu.edu.et/index.php/star/article/view/529.