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Any New Helly Numbers

(1982). Any New Helly Numbers? The American Mathematical Monthly: Vol. 89, No. 6, pp. 370-375.

E. Buchman | F. A. Valentine

[1] V. Klee. The Critical Set of a Convex Body , 1953 .

[2] P. Eklof. Ultraproducts for Algebraists , 1977 .