Mkrtchyan, A. R., et al. “AMPEROMETRIC DETERMINATION OF PALLADIUM(II) BY PHENYLTHIOUREA”. Proceedings of the YSU B: Chemical and Biological Sciences, vol. 39, no. 1 (206), Feb. 2005, pp. 139-42, doi:10.46991/PYSU:B/2005.39.1.139.