BibTeX

@ARTICLE{iumj30049,
    author = "Luis Caffarelli and E. Fabes and S. Mortola and Sandro Salsa",
     title = "Boundary Behavior of Nonnegative Solutions of Elliptic Operators in Divergence Form",
   journal = "Indiana Univ. Math. J.",
  fjournal = "Indiana University Mathematics Journal",
    volume = 30,
      year = 1981,
     issue = 4,
     pages = "621--640",
      issn = "0022-2518",
     coden = "IUMJAB",
   mrclass = "",
}

amsrefs

\bib{iumj30049}{article}{
     author = {Caffarelli, Luis},
     author = {Fabes, E.},
     author = {Mortola, S.},
     author = {Salsa, Sandro},
      title = {Boundary Behavior of Nonnegative Solutions of Elliptic Operators in Divergence Form},
    journal = {Indiana Univ. Math. J.},
     volume = {30},
       year = {1981},
     number = {4},
      pages = {621 \ndash 640},
}