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2. A tournament problem;Ford;American Mathematical Monthly,1959
3. On sorting by comparisons;Graham,1971
4. F.K. Hwang, Optimal merging of 3 elements with n elements, Memorandum, Bell Telephone Laboratories, Murray Hill, NJ, 1977
5. Optimal merging of 2 elements with n elements;Hwang;Acta Informatica,1971