Ramirez -Cuesta, A., Mitchell, P., Ross, D., Georgiev, P., Anderson, P., Langmi, H., & Book, D. (2007). Di-hydrogen in cation-substituted zeolite-X - an inelastic neutron scattering study. Journal of Materials Chemistry, 17, 2533-2539. https://doi.org/10.1039/b701167a