Model Selection for Joint Mean-Covariance Structures in Longitudinal Studies (with Gilbert MacKenzie) Biometrika, 90, 1,239-244, 2003
Daoji Li, Jianxin Pan (2013). Empirical likelihood for generalized linear models with longitudinal data. Journal of Multivariate Analysis. 2013 February; 114(February): 63-73. eScholarID:175733 | DOI:10.1016/j.jmva.2012.07.014