Ratcliffe, Sarah J., and Justine Shults. “GEEQBOX: A MATLAB Toolbox for Generalized Estimating Equations and Quasi-Least Squares”. Journal of Statistical Software 25, no. 14 (May 1, 2008): 1–14. Accessed April 27, 2024. https://www.jstatsoft.org/index.php/jss/article/view/v025i14.