Scokart, PO., & Rouxhet, P. (1981). Characterization of the Basic Properties of Sodium Exchanged Zeolites Through the Infrared Study of Pyrrole Adsorption. Societes Chimiques Belges. Bulletin, 90(9), 983-984. https://doi.org/10.1002/bscb.19810900916 (Original work published 1981)