1. ANSYS (2000). v. 5·6, ANSYS Inc., Canonsburg, USA
2. ASTM D1004 (1990). Standard test method for initial tear resistance of plastic film and sheeting. American Society for Testing and Materials, ASTM International, USA
3. ASTM D882 (1991). Standard test method for tensile properties of thin plastic sheeting. American Society for Testing and Materials, ASTM International, USA
4. Billmeyer F W (1984). Textbook of Polymer Science. Wiley Interscience Publication, New York
5. Briassoulis D (1996). The four-node C° shell element reformulated. International Journal for Numerical Methods in Engineering, 39, 2417–2455