@Article{ 
  FocGelSpa13,
  author = { Focardi, Matteo and Gelli, Maria Stella and Spadaro, Emanuele },
  title = { Monotonicity formulas for obstacle problems with Lipschitz coefficients },
  journal = { Calc. Var. Partial Differential Equations },
  year = { 2015 },
  doi = { 10.1007/s00526-015-0835-0  },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/2149/ },
  note = { cvgmt preprint}
}