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    ".. [1] Brunner, E. and Munzel, U. \"The nonparametric Benhrens-Fisher",
    "       problem: Asymptotic theory and a small-sample approximation\".",
    "       Biometrical Journal. Vol. 42(2000): 17-25.",
    ".. [2] Neubert, K. and Brunner, E. \"A studentized permutation test for the",
    "       non-parametric Behrens-Fisher problem\". Computational Statistics and",
    "       Data Analysis. Vol. 51(2007): 5192-5204."
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