MathSciNet bibliographic data MR567994 04A20 (54A25 54D40) Balcar, Bohuslav; Vojtáš, Peter Almost disjoint refinement of families of subsets of ${\bf N}$${\bf N}$. Proc. Amer. Math. Soc. 79 (1980), no. 3, 465–470. Article

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