SYNTHESIS AND STRUCTURAL CHARACTERIZATION OF [PD-4(MU(3)-CH)(MU-CL)(3)(PBU(3)(T))(4)] - A TETRAHEDRAL PALLADIUM CLUSTER-WITH A MU(3)-METHYLIDYNE LIGAND - BURROWS,AD; MINGOS,DMP; MENZER,S; VILAR,R; WILLIAMS,DJ (JOURNAL OF THE CHEMICAL SOCIETY-DALTON TRANSACTIONS, 1995)