To cite package 'longpower' in publications use:

Donohue MC (2021). longpower: Power and sample size calculations for linear mixed models. R package version 1.0.23.

Diggle PJ, Heagerty PJ, Liang KY, Zeger SL (2002). Analysis of longitudinal data, Second Edition edition. Oxford Statistical Science Serires.

Liu G, Liang KY (1997). “Sample size calculations for studies with correlated observations.” Biometrics, 53(3), 937-47.

Lu K, Luo X, Chen P (2008). “Sample size estimation for repeated measures analysis in randomized clinical trials with missing data.” International Journal of Biostatistics, 4(1), 937-47.

Corresponding BibTeX entries:

  @Manual{,
    title = {longpower: Power and sample size calculations for linear
      mixed models},
    author = {Michael C. Donohue},
    year = {2021},
    note = {R package version 1.0.23},
  }

  @Book{,
    title = {Analysis of longitudinal data},
    author = {P. J. Diggle and P. J. Heagerty and K. Y. Liang and S. L.
      Zeger},
    year = {2002},
    edition = {Second Edition},
    publisher = {Oxford Statistical Science Serires},
  }

  @Article{,
    title = {Sample size calculations for studies with correlated
      observations},
    author = {G. Liu and K. Y. Liang},
    year = {1997},
    journal = {Biometrics},
    volume = {53(3)},
    pages = {937-47},
  }

  @Article{,
    title = {Sample size estimation for repeated measures analysis in
      randomized clinical trials with missing data},
    author = {K. Lu and X. Luo and P.-Y. Chen},
    year = {2008},
    journal = {International Journal of Biostatistics},
    volume = {4(1)},
    pages = {937-47},
  }