Geometric permutations for convex sets
Tài liệu tham khảo
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Grünbaum, 1959, On common transversals, Arch. Math., 9, 465, 10.1007/BF01898631
Grünbaum, 1967
Hadwiger, 1964
M. Katchalski, T. Lewis and A. Liu, Geometric permutations and common transversals, submitted.
Lay, 1982
Lewis, 1980, Two counterexamples concerning transversals for convex subsets of the plane, Geometriae Dedicata, 9, 461, 10.1007/BF00181561