BibTeX

@ARTICLE{iumj22082,
    author = "R. Redheffer",
     title = "Supplementary Remarks on the Sharp Maximum Principle",
   journal = "Indiana Univ. Math. J.",
  fjournal = "Indiana University Mathematics Journal",
    volume = 22,
      year = 1973,
     issue = 10,
     pages = "985--987",
      issn = "0022-2518",
     coden = "IUMJAB",
   mrclass = "",
}

amsrefs

\bib{iumj22082}{article}{
     author = {Redheffer, R.},
      title = {Supplementary Remarks on the Sharp Maximum Principle},
    journal = {Indiana Univ. Math. J.},
     volume = {22},
       year = {1973},
     number = {10},
      pages = {985 \ndash 987},
}