© 2012 Szczecińskie Towarzystwo Naukowe. The electronic version is freely available on the internet (Open Access Journal). We have adopted a Creative Commons licence CC BY-NC-ND 4.0 (Attribution-NonCommercial-NoDerivs)
This item's license is described as
 © 2012 Szczecińskie Towarzystwo Naukowe. The electronic version is freely available on the internet (Open Access Journal). We have adopted a Creative Commons licence CC BY-NC-ND 4.0 (Attribution-NonCommercial-NoDerivs)





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