References
Znám, Št.: On exactly covering systems of arithmetic sequences. Math. Ann.180, 227–232 (1969).
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Newman, M. Roots of unity and covering sets. Math. Ann. 191, 279–282 (1971). https://doi.org/10.1007/BF01350330
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DOI: https://doi.org/10.1007/BF01350330