Combinatorics : set systems, hypergraphs, families of vectors, and combinatorial probability / Béla Bollobás. Bollobás, Béla. Combinatorial analysis. QA164 .B65 1986 511.6 19 BOC Includes index. Bibliography: p. [168]-175. Cambridge [Cambridgeshire] ; New York : Cambridge University Press, c1986. c1986. 1986 Text xii, 177 p. : http://www.loc.gov/catdir/description/cam023/86009602.html http://www.loc.gov/catdir/toc/cam029/86009602.html eng