1. Lappeenranta University of Technology, Group of Packaging Technology , Lappeenranta , Finland
2. Vilnius University, Physics Faculty, Sauletekio , Vilnius , Lithuania
3. University of Bialystok Vilnius Branch , Vilnius , Lithuania
4. Vilnius University, Physics Faculty, Sauletekio Vilnius , Lithuania
5. Vilnius Gediminas Technical University, J. Basanavicius , Vilnius , Lithuania