1. Bellman, R. R.Introduction to matrix analysis. New York: McGraw-Hill, 1960.
2. Lawley, D. N. A note on Karl Pearson's selection formulae.Proceedings of the Royal Society of Edinburgh (Section A), 1943–44,62, 28–30.
3. Meredith, W. Notes on factorial invariance.Psychometrika, 1964,29, 177–185.
4. Thurstone, L. L.Multiple factor analysis. Chicago: University of Chicago Press, 1947.
5. Tucker, L. R. Implications of factor analysis of three-way matrices for measurement of change. In C. W. Harris (Ed.),Problems in measuring change. Madison: University of Wisconsin Press, 1963, 122–137.