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"A Symmetrical Beauty. A Non-simple 7-Venn Diagram With A Minimum Vertex Set."
Peter Hamburger, Raymond E. Pippert (2003)
- Peter Hamburger, Raymond E. Pippert:
A Symmetrical Beauty. A Non-simple 7-Venn Diagram With A Minimum Vertex Set. Ars Comb. 66 (2003)

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