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This research was supported by the Sakko-kai Foundation
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Sugiura, N., Ôtake, M. Numerical comparison of improved methods of testing in contingency tables with small frequencies. Ann Inst Stat Math 20, 505–517 (1968). https://doi.org/10.1007/BF02911663
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DOI: https://doi.org/10.1007/BF02911663