To cite sparsenet in publications use:

Rahul Mazumder, Jerome Friedman, Trevor Hastie (2011). SparseNet: Coordinate Descent With Nonconvex Penalties. Journal of American Statistical Association, 106(495), 1125-1138. URL http://www.stanford.edu/~hastie/Papers/Sparsenet/jasa_MFH_final.pdf

Corresponding BibTeX entry:

  @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 =
      {http://www.stanford.edu/~hastie/Papers/Sparsenet/jasa_MFH_final.pdf},
  }