@Article{ 
  capgreiwa00,
  author = { Capone, Claudia and Greco, Luigi and Iwaniec, Tadeusz },
  title = { Higher Integrability via Riesz Transforms and Interpolation },
  journal = { Nonlinear Analysis },
  year = { 2002 },
  volume = { 49 },
  pages = { 513-523 },
  URL = { http://cvgmt.sns.it/paper/973/ },
  note = { cvgmt preprint}
}