Verdonck, JJ., Jacobs, P. A., Genet, M., & Poncelet, G. (1980). Redox Behavior of Transition-metal Ions in Zeolites .8. Characterization of a Ruthenium Metal Phase in Nay Zeolite. Journal of the Chemical Society. Faraday Transactions I, 76, 403-416. https://doi.org/10.1039/f19807600403 (Original work published 1980)