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Cohen Eckford; Davis K. Joseph: Elementary estimates for certain types of integers. In: Acta scientiarum mathematicarum, (31) 3-4. pp. 363-371. (1970)
Cohen Eckford: Remark on a set of integers. In: Acta scientiarum mathematicarum, (25) 3-4. pp. 179-180. (1964)
Cohen Eckford: Some sets of integers related to the k-free integers. In: Acta scientiarum mathematicarum, (22) 3-4. pp. 223-233. (1961)