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Richardson, Chris, Steel, Peter J., D'alessandro, Deanna M., Junk, Peter C., and Keene, F. Richard (2002) Mono- and di-nuclear complexes of the ligands 3,4-di(2-pyridyl)-1,2,5-oxadiazole and 3,4-di(2-pyridyl)-1,2,5-thiadiazole; new bridges allowing unusually strong metal–metal interactions. Dalton Transactions, 2002 (13). pp. 2775-2785.