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Van Leeuwen, Leo C. A.: On questions of hereditariness of radicals. Acta scientiarum mathematicarum, (47) 3-4. pp. 307-319. (1984)
Van Leeuwen, Leo C. A.: Complements of radicals in the class of hereditarily artinian rings. Acta scientiarum mathematicarum, (39) 3-4. pp. 313-318. (1977)
Van Leeuwen, Leo C. A.: Rings with e as a radical element. Acta scientiarum mathematicarum, (38) 1-2. pp. 97-102. (1976)
Van Leeuwen, Leo C. A.: On p-pure subgroups of torsion-free cotorsion groups. Acta scientiarum mathematicarum, (35). pp. 95-106. (1973)