To cite package ‘rOPTRAM’ in publications use:

  Silver M, Beiden R, Karnieli A (2023). “rOPTRAM: an R package for
  preparing soil moisture grids based on the OPTRAM model.”

A BibTeX entry for LaTeX users is

  @Misc{,
    title = {rOPTRAM: an R package for preparing soil moisture grids based on the OPTRAM model},
    author = {Micha Silver and Ron Beiden and Arnon Karnieli},
    year = {2023},
    school = {Ben Gurion University},
  }