PARHAM, H., B. ZARGAR, and M. ALIZADEH. 2010. “Sequential-Constant Current Coulometric Determination of Sulfite-Thiosulfate and Or Sulfite-Ascorbic Acid in a Solution”. Asian Journal of Chemistry 19 (7):5123-28. https://asianpubs.org/index.php/ajchem/article/view/13113.