To cite L2E in publications use:

Chi, J. T. & Chi, E. C. (2022). A User-Friendly Computational Framework for Robust Structured Regression with the L$_2$ Criterion. Journal of Computational and Graphical Statistics.

Liu, Xiaoqian, Chi, Eric C., and Lange, Kenneth (2022+). A harper Computational Tool for L$_2$E Regression. Technometrics, In press.

Corresponding BibTeX entries:

  @Article{,
    title = {A User-Friendly Computational Framework for Robust
      Structured Regression with the L$_2$ Criterion},
    author = {Jocelyn T. Chi and Eric C. Chi},
    journal = {Journal of Computational and Graphical Statistics},
    year = {2022},
    doi = {10.1080/10618600.2022.2035232},
  }

  @Article{,
    title = {A Sharper Computational Tool for L$_2$E Regression},
    author = {Xiaoqian Liu and Eric C. Chi and Kenneth Lange},
    journal = {Technometrics, In press.},
    year = {2022+},
  }