Lalancette, Roger, and Ivan Bernal. “In an Attempt to Add Ligands to the Sixth (axial) Position of Vanadyl Bis-Acetylacetonate: A Unique Tetranuclear Vanadyl Species”. European Journal of Chemistry, vol. 14, no. 4, Dec. 2023, pp. 494-8, doi:10.5155/eurjchem.14.4.494-498.2485.