Ghaemi, Arezoo, et al. “Preparation, Spectral and Thermal Characterization of Two Novel Mixed-Valent and Metal Trinuclear Oxo-Centered Complexes”. Asian Journal of Chemistry, vol. 24, no. 7, Mar. 2012, pp. 3177-80, https://asianpubs.org/index.php/ajchem/article/view/9323.