To cite package ‘MultiSpline’ in publications use:

  Hait S (2026). _MultiSpline: Spline-Based Nonlinear Modeling for
  Multilevel and Longitudinal Data_. R package version 0.2.0,
  <https://github.com/causalfragility-lab/multispline>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {MultiSpline: Spline-Based Nonlinear Modeling for Multilevel and Longitudinal
Data},
    author = {Subir Hait},
    year = {2026},
    note = {R package version 0.2.0},
    url = {https://github.com/causalfragility-lab/multispline},
  }