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Wrocław University of Environmental and Life Sciences allows free reprinting of articles, provided that this fact is notified by e-mail and the source of the article is provided. In portals and websites, please provide a link to the article, and in journals, annotations: Source: Website of the project digitag-erasmusproject.upwr.edu.pl. In the case of social networks, please include the title and lead with a link to the content of the article on our website.