1. Golub, G. H. On the number of significant factors as determined by the method of maximum likelihood. (Stencilled) Digital Computer Laboratory, Univ. of Illinois, 1954.
2. Guttman, L. Multiple rectilinear prediction and the resolution into components.Psychometrika, 1940,5, 75–99.
3. Guttman, L. Image theory for the structure of quantitative variates.Psychometrika, 1953,18, 277–296.
4. Guttman, L. Some necessary conditions for common-factor analysis.Psychometrika, 1954,19, 149–161.
5. Guttman, L. A new approach to factor analysis: the radex. In Paul F. Lazarsfeld (ed.), Mathematical thinking in the social sciences, Glencoe, Ill.: Free Press, 1954.