@Article{ 
  bec09,
  author = { Beck, Lisa },
  title = { Boundary regularity for elliptic problems with continuous coefficients },
  journal = { J. Convex Anal. },
  year = { 2009 },
  volume = { 16 },
  number = { 2 },
  pages = { 287-320 },
  URL = { http://cvgmt.sns.it/paper/677/ },
  note = { cvgmt preprint}
}