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P. Erdös and G. Szekeres, “On Some Extremum Problems in Elementary Geometry,” Annales Universitatis Scientarium Budapestinensis de Rolando Eötvös Nominatae Sectio Mathematica, Vol. 3-4, No. 1, 1961, pp. 53-62. (Reprinted in: J. Spencer, Ed., Paul Erdös: The Art of Counting. Selected Writings, MIT Press, Cambridge, 1973, pp. 680-689.)

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