BibTeX

@ARTICLE{iumj23020,
    author = "M. Protter and H. Weinberger",
     title = "A Maximum Principle and Gradient Bounds for Linear Elliptic Equations",
   journal = "Indiana Univ. Math. J.",
  fjournal = "Indiana University Mathematics Journal",
    volume = 23,
      year = 1974,
     issue = 3,
     pages = "239--249",
      issn = "0022-2518",
     coden = "IUMJAB",
   mrclass = "",
}

amsrefs

\bib{iumj23020}{article}{
     author = {Protter, M.},
     author = {Weinberger, H.},
      title = {A Maximum Principle and Gradient Bounds for Linear Elliptic Equations},
    journal = {Indiana Univ. Math. J.},
     volume = {23},
       year = {1974},
     number = {3},
      pages = {239 \ndash 249},
}