1. MSE dominance of least squares with errors of observation;Aigner;Journal of Econometrics,1974
2. Causal Inferences in Nonexperimental Research;Blalock,1964
3. Structural Equations with Latent Variables;Bollen,1989
4. Structural equation models;Bollen,1998
5. A tetrad test for causal indicators;Bollen;Psychological Methods,2000