Wheatley, G., and R. S. Sandeepa Chandrasiri. “Mechanical Testing of Recycled HDPE Extruded Hollow Section”. ANNUAL JOURNAL OF TECHNICAL UNIVERSITY OF VARNA, BULGARIA, Vol. 4, no. 2, Dec. 2020, pp. 112-21, doi:10.29114/ajtuv.vol4.iss2.180. Accessed 26 Jan. 2021.