[1] Fisher R. A.: The fiducial argument in statistical inference. Ann. Eug. Lond. 6 (1935), str. 391.
[2] Welch L. B.: The generalisation of Student's problem when several different population variances are involved. Biometrika XXXIV (1947), str. 28 - 35.
[3] Sukhatme P. V.: On Fisher and Behrens' test of significance for the difference in means of two normal samples. Sankhya 4 (1938), str. 39.
[4] Aspin A. A.:
Tables for use in comparisons, whose accuracy involves two variances. Biometrika XXXVI (1949), str. 290-292.
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[5] Welch L. B.: Further note on Mrs Aspin's tables and on certain aproximations to the tabulated function. Biometrika XXXVI (1949), str. 293-296.