Vignati, Davide A.L., Roberta Bettinetti, and Aldo Marchetto. “Long-Term Persistence of Sedimentary Copper Contamination in Lake Orta: Potential Environmental Risks 20 Years After Liming”. Journal of Limnology 75, no. s2 (April 13, 2016). Accessed October 24, 2020. https://jlimnol.it/index.php/jlimnol/article/view/jlimnol.2016.1232.