@Article{ 
  DiMSpe13,
  author = { Di Marino, Simone and Speight, Gareth },
  title = { The p-Weak Gradient Depends on p },
  journal = { Proceedings of the American Mathematical Society },
  year = { 2014 },
  volume = { 143 },
  number = { 5239-5252 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/2283/ },
  note = { cvgmt preprint}
}