A new highly efficient tetra-electronic catalyst based on a cobalt porphyrin bound to four `mü IND. 3´-oxo-ruthenium acetate clusters - Araki, Koiti; Dovidauskas, Sergio; Winnischofer, Herbert; Alexiou, Anamaria Dias Pereira; Toma, Henrique Eisi (Journal of Electroanalytical Chemistry, 2001)