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2. Information on http://www.upakovano.ru/articles/1510.
3. Information on https://www.unipack.ru/pdf/films.pdf.
4. J. Breil, Oriented Film Technology, in: John R. Wagner, Jr., Multilayer Flexible Packaging, Second Edition, Elsevier Inc., 2016, pp.153-172.
5. Shrikant P Athavale, Handbook of Printing, Packaging and Lamination: Packaging Technology, Published by Notion Press, Inc., New York, United States, (2018).