1. A new look at the statistical model identification;Akaike;IEEE Transactions on Automatic Control,1974
2. Comparing latent distributions;Andersen;Psychometrika,1980
3. Estimating latent correlations between repeated testings;Andersen;Psychometrika,1985
4. Asparouhov , T. Muthén , B. 2012 General random effect latent variable modeling: Random subjects, items, contexts, and parameters
5. Bates , D. Maechler , M. 2009 lme4: Linear mixed-effects models using s4 classes http://cran.r-project.org/web/packages/lme4/index.html