Beshah, Birhanu, Aychiluhim Mitiku, Michael Chernet, Mekdes Assefa, and Mezekeir Addisu. 2014. “Mechanical Property of Plastic Lumber Produced from Recycled High Density Polyethylene (HDPE)”. Journal of Science, Technology and Arts Research 3 (1):141-44. https://journals.wgu.edu.et/index.php/star/article/view/529.