To cite abess in publications use:

Zhu J, Wen C, Zhu J, Zhang H, Wang X (2020). “A polynomial algorithm for best-subset selection problem.” Proceedings of the National Academy of Sciences, 117(52), 33117–33123. https://www.pnas.org/content/117/52/33117.

Corresponding BibTeX entry:

  @Article{,
    title = {A polynomial algorithm for best-subset selection problem},
    author = {Junxian Zhu and Canhong Wen and Jin Zhu and Heping Zhang
      and Xueqin Wang},
    journal = {Proceedings of the National Academy of Sciences},
    year = {2020},
    volume = {117},
    number = {52},
    pages = {33117--33123},
    url = {https://www.pnas.org/content/117/52/33117},
  }