Reference
E. L. Lehmann,Testing Statistical Hypotheses, John Wiley and Sons Inc., 1959.
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Sugiura, N. An example of the two-sided wilcoxon test which is not unbiased. Ann Inst Stat Math 17, 261–263 (1965). https://doi.org/10.1007/BF02868170
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DOI: https://doi.org/10.1007/BF02868170