Brogden, H. E. An approach to the problem of differential prediction.Psychometrika, 1946,11, 139–154.
Dwyer, P. S. Solution of the personnel classification problem with the method of optimal regions.Psychometrika, 1954,19, 11–26.
Lord, F. M. Notes on a problem of multiple classification.Psychometrika, 1952,17, 297–304.
Rao, C. R. Advanced statistical methods in biometric research. New York: Wiley, 1952.
Votaw, D. F. Methods of solving some personnel classification problems.Psychometrika, 1952,17, 255–266.