To cite package 'QUIC' in publications use:

Sparse Inverse Covariance Matrix Estimation Using Quadratic Approximation, Cho-Jui Hsieh, Matyas A. Sustik, Inderjit S. Dhillon, Pradeep Ravikumar, Advances in Neural Information Processing Systems 24, 2011, p. 2330--2338.

Corresponding BibTeX entry:

  @InCollection{,
    title = {Sparse Inverse Covariance Matrix Estimation Using
      Quadratic Approximation},
    author = {Cho-Jui Hsieh and Matyas A. Sustik and Inderjit S.
      Dhillon and Pradeep Ravikumar},
    booktitle = {Advances in Neural Information Processing Systems 24},
    publisher = {http://nips.cc/},
    year = {2011},
    editor = {J. Shawe-Taylor and R.S. Zemel and P. Bartlett and F.C.N.
      Pereira and K.Q. Weinberger},
    pages = {2330--2338},
    url = {http:\www.cs.utexas.edu/users/sustik/QUIC},
  }