To cite sparsenet in publications use:

  Mazumder R, Friedman J, Hastie T (2011). “SparseNet: Coordinate
  Descent With Nonconvex Penalties.” _Journal of American Statistical
  Association_, *106*(495), 1125-1138.
  <https://hastie.su.domains/public/Papers/Sparsenet/Mazumder-SparseNetCoordinateDescent-2011.pdf>.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {SparseNet: Coordinate Descent With Nonconvex Penalties},
    author = {Rahul Mazumder and Jerome Friedman and Trevor Hastie},
    journal = {Journal of American Statistical Association},
    year = {2011},
    volume = {106},
    number = {495},
    pages = {1125--1138},
    url = {https://hastie.su.domains/public/Papers/Sparsenet/Mazumder-SparseNetCoordinateDescent-2011.pdf},
  }