@Misc{ 
  ColStr15,
  author = { Colombo, Maria and Stra, Federico },
  title = { Counterexamples in multimarginal optimal transport with Coulomb cost and
  spherically symmetric data },
  journal = { Math. Models Methods Appl. Sci. },
  year = { 2015 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/2756/ },
  note = { cvgmt preprint}
}