@Misc{ 
  GelVal17,
  author = { Geldhauser, Carina and Valdinoci, Enrico },
  title = { Optimizing the fractional power in a model with stochastic PDE constraints },
  journal = {  },
  year = { 2017 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/3383/ },
  note = { cvgmt preprint}
}