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"On the Closure of Subsets of {4, 5, ..., 9} which contain {4}."
Ronald C. Mullin et al. (1997)
- Ronald C. Mullin, Alan C. H. Ling, R. Julian R. Abel, Frank E. Bennett:
On the Closure of Subsets of {4, 5, ..., 9} which contain {4}. Ars Comb. 45 (1997)
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