Areán, C. O. “Probing Brønsted Acidity of Protonic Zeolites With Variable-Temperature Infrared Spectroscopy”. Ukrainian Journal of Physics 63, no. 6 (July 12, 2018): 538. Accessed September 20, 2025. https://ujp.bitp.kiev.ua/index.php/ukj/article/view/2018007.