@article{JMLR:v11:yu10a,
  author  = {Jin Yu and S.V.N. Vishwanathan and Simon G{{\"u}}nter and Nicol N. Schraudolph},
  title   = {A Quasi-Newton Approach to Nonsmooth Convex Optimization Problems in Machine Learning},
  journal = {Journal of Machine Learning Research},
  year    = {2010},
  volume  = {11},
  number  = {39},
  pages   = {1145--1200},
  url     = {http://jmlr.org/papers/v11/yu10a.html}
}