Papaefstathiou, GS Escuer, A Raptopoulou, CP Terzis, A and Perlepes, SP Vicente, R, Defective double-cubane, tetranuclear manganese(II) and cobalt(II) complexes with simultaneous mu(1,1)-Azido and mu-O bridges, European Journal of Inorganic Chemistry, 1567-1574, 2001, 1434-1948, 1099-0682