A Fortran IV Program for the Welch-Aspin Solution of the Behrens-Fisher Problem

Aspin, A. A. An examination and further development of a formula arising in the problem of comparing two mean values. Biometrika, 1948, 35, 88-96.

Aspin, A. A. Tables for use in comparisons whose accuracy involves two variances, separately estimated. Biometrika, 1949, 36, 290-293.

Pearson, E. S. and Hartley, H. O. Biometrika tables for statisticians. Cambridge, England: Cambridge University Press, 1966.

Trickett, W. H. , Welch, B. L. , and James, G. S. Further critical values for the two-means problem. Biometrika , 1956, 43, 203-205.

Welch, B. L. The generalization of 'Student's' problems when several different population variances are involved. Biometrika, 1947, 34, 28-35.

Welch, B. L. Further note on Mrs. Aspin's tables and on certain approximations to the tabled function. Biometrika, 1949, 36, 293-296.