Al-Baldawi, Ammar, Shatha K. Muallah, and Olaf Wünsch. 2013. “Thermo-Rheological Investigation and Modeling of the Shear Viscosity of Polypropylene above the Melting Temperature”. Al-Khwarizmi Engineering Journal 9 (4): 12-23. https://www.alkej.uobaghdad.edu.iq/index.php/alkej/article/view/181.