Wilkosz I. “Effect of Chromium(III) on the Sulphur(IV) Oxidation Catalysed by Manganese(II) under Conditions Representative for Atmospheric Waters”. International Journal of Research in Chemistry and Environment (IJRCE), vol. 5, no. 3, June 2015, pp. 18-23, https://ijrce.org/index.php/ijrce/article/view/322.