Y. M. Zhukov, A. Yu. Efimov, M. G. Shelyapina, V. Petranovskii, E. V. Zhizhin, A. Burovikhina, and I. A. Zvereva,
Effect of preparation method on the valence state and encirclement of copper exchange ions in mordenites,
Microporous and Mesoporous Materials 224 415 (2016)