On A Combinatorial Problem III
Canadian mathematical bulletin, Tome 12 (1969) no. 4, pp. 413-416

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A family of sets {Aα} is said by Miller [3] to have property B if there exists a set S which meets all the sets Aα and contains none of them. Property B has been extensively studied in several recent papers (see the references in [2] and the last chapter of P. Erdös and A. Hajnal, On chromatic number of graphs and set systems, Acta. Math. Acad. Sci. Hung. 17 (1966) 61–99).
Erdős, P. On A Combinatorial Problem III. Canadian mathematical bulletin, Tome 12 (1969) no. 4, pp. 413-416. doi: 10.4153/CMB-1969-051-5
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     author = {Erd\H{o}s, P.},
     title = {On {A} {Combinatorial} {Problem} {III}},
     journal = {Canadian mathematical bulletin},
     pages = {413--416},
     year = {1969},
     volume = {12},
     number = {4},
     doi = {10.4153/CMB-1969-051-5},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1969-051-5/}
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