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- [2] DIFFERENCE-COVERS THAT ARE NOT K-SUM-COVERS .1. PROCEEDINGS OF THE CAMBRIDGE PHILOSOPHICAL SOCIETY-MATHEMATICAL AND PHYSICAL SCIENCES, 1972, 72 (NOV): : 425 - &
- [3] INTEGER DIFFERENCE COVERS WHICH ARE NOT K-SUM COVERS, FOR K = 6,7 PROCEEDINGS OF THE CAMBRIDGE PHILOSOPHICAL SOCIETY, 1973, 74 (JUL): : 17 - 28