Heidel , C. (2009) "The Isotopic Composition of Sulphate Formed by Pyrite Oxidation Experiments – the Influence of Pyrite Grain Size", Записки Горного института, 181, сс. 7-10. доступно на: https://pmi.spmi.ru/pmi/article/view/7010 (просмотрено: 1 февраль 2026).

Heidel , C. (2009) "The Isotopic Composition of Sulphate Formed by Pyrite Oxidation Experiments – the Influence of Pyrite Grain Size", Journal of Mining Institute, 181, pp. 7-10. Available at: https://pmi.spmi.ru/pmi/article/view/7010 (Accessed: 1 February 2026).