To cite package ‘sparseR’ in publications use:

  Peterson, R.A., Cavanaugh, J.E. Ranked sparsity: a cogent
  regularization framework for selecting and estimating feature
  interactions and polynomials. AStA Adv Stat Anal (2022).
  https://link.springer.com/article/10.1007/s10182-021-00431-7

A BibTeX entry for LaTeX users is

  @Article{,
    title = {Ranked Sparsity: A Cogent Regularization Framework for Selecting and Estimating Feature Interactions and Polynomials},
    author = {Ryan A. Peterson and Joseph E. Cavanaugh},
    year = {2022},
    journal = {AStA Advances in Statistical Analysis},
    doi = {10.1007/s10182-021-00431-7},
  }