Lycourghiotis, A., Defosse, C., & Delmon, B. (1980). Effect of Sodium On the Co-gamma-a1203 System - Influence of the Preparation Conditions and Calcination Temperature. Societes Chimiques Belges. Bulletin, 89(11), 929-935. https://doi.org/10.1002/bscb.19800891101 (Original work published 1980)