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"On covering designs with block size 5 and index 11≤λ≤21: ..."
Ahmed M. Assaf, L. P. S. Singh (1997)
- Ahmed M. Assaf, L. P. S. Singh:
On covering designs with block size 5 and index 11≤λ≤21: the case v≡0(mod 4). Australas. J Comb. 15: 91-122 (1997)

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