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2. Problems and results in graph theory and combinatorial analysis;Erdös;Proc. 5th British Combinatorial Conference, Aberdeen,1975
3. Venn diagrams and independent families of sets;Grünbaum;Math. Mag.,1975
4. Combinatorial Theory;Hall,1967
5. Shapes of the Future—Some Unsolved Problems in Geometry Manual. Part II;Klee,1972