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4. O.S. Carneiro, Design of extrusion forming tools (Smithers Rapra Technology Ltd, Shawbury, 2012).
5. T. Bezigian, The Development of the Nano-Layer Blown Film Die. Availaible: https://bbsdies.com/wp-content/uploads/2021/04/82-Layer-Die-Development-9-14-16-1800-hrs.pdf