29035 Ian Anderson: Intersection theorems and a lemma of Kleitman.
Discrete Math. 16/3 (1976), 181-185.

26820 F. Bennett/L. Wu: On minimum matrix representations of closure operations.
Discrete Appl. Math. 26 (1990), 25-40.

26819 F. Bennett/L. Wu: Minimum matrix representations of Sperner systems.
Discrete Appl. Math. 8/1 (1998), 9-17.

15990 Bela Bollobas: Combinatorics. Set systems, hypergraphs, families
of vectors and combinatorial probability. Cambridge UP 1998, 180p. $22.

29016 Konrad Engel: Sperner theory. Cambridge UP 1997, 420p. Pds. 50.

29036 Daniel Kleitman: Families of non-disjoint subsets.
J. Comb. Theory 1 (1966), 153-155.

29034 Mark Siggers/Norihidde Tokushige: The maximum size of intersecting and union
families of sets. Europ. J. Comb. 33 (2012), 128-138.