1. AZO Materials, “Aluminum: A Cheap Substitute for Copper,” 2022. [Online]. Available: https://www.azom.com/news.aspx?newsID=59467.
2. AZO mining, “Austria: mining, minerals and fuel resources,” 2012. [Online]. Available: https://www.azomining.com/Article.aspx?ArticleID=127. [Accessed 21 August 2022].
3. Boemkem, M. and Watson, F.A.W. "Mining in Germany: overview," 2021. [Online]. Available: https://uk.practicallaw.thomsonreuters.com/w-029-7180?transitionType=Default&contextData=(sc.Default). [Accessed 23 July 2022].
4. Braide, B., “The Advantages and Disadvantages of Local and Global Sourcing,” 2021. [Online]. Available: https://medium.com/@bomabraide/the-advantages-and-disadvantages-of-local-and-global-sourcing-135fd109f550.
5. Global employment and skill level requirements for 'Post-Carbon Europe;Černý;Ecological Economics Volume,2024