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Van Leeuwen, Leonard C. A.: Remarks on endomorphism rings of torsion-free abelian groups. Acta scientiarum mathematicarum, (32) 3-4. pp. 345-350. (1971)
Van Leeuwen, Leonard C. A.: Square extensions of finite rings. Acta scientiarum mathematicarum, (29) 3-4. pp. 247-260. (1968)
Van Leeuwen, Leonard C. A.: On the endomorphism ring of direct sums of groups. Acta scientiarum mathematicarum, (28) 1-2. pp. 21-29. (1967)