To cite jmcm in publications use:

Pan J and Pan Y (2017). “jmcm: An R Package for Joint Mean-Covariance Modeling of Longitudinal Data.” Journal of Statistical Software, 82(9), pp. 1–29. doi: 10.18637/jss.v082.i09.

Corresponding BibTeX entry:

  @Article{,
    title = {{jmcm}: An {R} Package for Joint Mean-Covariance Modeling
      of Longitudinal Data},
    author = {Jianxin Pan and Yi Pan},
    journal = {Journal of Statistical Software},
    year = {2017},
    volume = {82},
    number = {9},
    pages = {1--29},
    doi = {10.18637/jss.v082.i09},
  }