1. Aitchison, W., & Silvey, S.D. (1958). Maximum likelihood estimation of parameters subject to restraints.Annals of Mathematical Statistics, 28, 813–828.
2. Andersen, E.B. (1995). Polytomous Rasch models and their estimation. In G.H. Fisher & I.W. Molenaar (Eds.).Rasch models: Foundations, recent developments and applications. New York, NY: Springer Verlag.
3. Andres, J. (1990).Grundlagen Linearer Strukturgleichungsmodelle [Foundations of linear structural equation models]. New York, NY: Peter Lang.
4. Baker, F.B. (1993). Sensitivity of the linear logistic test model to misspecification of the weight matrix.Applied Psychological Measurement, 17, 201–211.
5. Basilevsky, A. (1983).Applied matrix algebra in the statistical sciences. New York, NY: North-Holland.