YANG, WENZHONG, et al. “Reduction of Tin(II) and Antimony(III) in the 1-Ethyl-3-Methylimidazolium Tetrafluoroborate Ionic Liquid”. Asian Journal of Chemistry, vol. 20, no. 5, Mar. 2010, pp. 3677-86, https://asianpubs.org/index.php/ajchem/article/view/12743.