1. H. Hoog Choice and development of catalysts in industrial chemistry 1951 872
2. A tentative method for the determination of the base exchange capacity of small samples of clay minerals;v. Olphen;Clay Minerals Bull.,1951
3. Structural factors governing the reactivities of α-methylenic groups towards active free radicals;Kooyman;Faraday Society Discussion,1951
4. A theoretical approach of the colloid-chemical stability of dispersions in hydrocarbons;Mackor;J. Colloid Sci.,1951