To cite package ‘simest’ in publications use:

  Kuchibhotla AK, Patra RK (2025). _simest: Constrained Single Index
  Model Estimation_. R package version 0.4-1-1,
  <https://curves-etc.r-forge.r-project.org/>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {simest: Constrained Single Index Model Estimation},
    author = {Arun Kumar Kuchibhotla and Rohit Kumar Patra},
    year = {2025},
    note = {R package version 0.4-1-1},
    url = {https://curves-etc.r-forge.r-project.org/},
  }