Pandey, R.N., et al. “Physico-Chemical Studies on Some Mixed Ligand Hydrido-Phosphine Complexes of Ir(III) With Ethylene Thiourea”. Asian Journal of Chemistry, vol. 6, no. 3, July 2012, pp. 460-3, https://asianpubs.org/index.php/ajchem/article/view/24589.