To cite spfda in publications use:

Wang Z, Magnotti JF, Beauchamp MS, Li M (2022). “Functional Group Bridge for Simultaneous Regression and Support Estimation.” Biometrics, 79(2), 1226-1238. doi:10.1111/biom.13684.

Corresponding BibTeX entry:

  @Article{,
    title = {Functional Group Bridge for Simultaneous Regression and
      Support Estimation},
    author = {Zhengjia Wang and John F. Magnotti and Michael S.
      Beauchamp and Meng Li},
    journal = {Biometrics},
    year = {2022},
    volume = {79},
    number = {2},
    pages = {1226-1238},
    year = {2022},
    month = {05},
    doi = {10.1111/biom.13684},
  }