U. Bodensieck, A. Meister, G. Meister, G. Rheinwald, H. Stoeckli-Evans, and G. Süss-Fink, “Hydrogen Activation by Benzene-Ruthenium Complexes in Aqueous Solution: Synthesis, Molecular Structure, and Intercalation of the Cluster Cation [{C₆H₆)₄Ru₄H₄]²⁺”, Chimia, vol. 47, no. 6, p. 189, Jun. 1993, doi: 10.2533/chimia.1993.189.