Synthesis and structural characterisation of the palladium cluster compounds [Pd3(μ-SO2)2(μ-PPh2py)2(PBz3)2] and [Pd4(μ-SO2)2(μ3-S)(CNR)(PBz3)4] (R = tBu, 2,6-dimethylphenyl and cyclohexyl) - Williamson,AM; Owen,GR; Mingos,DMP; Vilar,R; White,AJP; Williams,DJ (DALTON TRANSACTIONS, 2003)