Šolar, Slavko Vekoslav, Deborah J. Shields, and H. William Langer. “Important Features of Sustainable Aggregate Resource Management”. Geologija 47, no. 1 (June 30, 2004): 99–108. Accessed April 24, 2024. https://www.geologija-revija.si/index.php/geologija/article/view/1002.