@Misc{ 
  MarMas14,
  author = { Marchese, Andrea and Massaccesi, Annalisa },
  title = { An optimal irrigation network with infinitely many branching points },
  journal = { ESAIM: COCV },
  year = { 2014 },
  doi = { http://dx.doi.org/10.1051/cocv/2015028 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/2497/ },
  note = { cvgmt preprint}
}