BibTeX

@ARTICLE{iumj53022,
    author = "M. Protter",
     title = "New Boundary Value Problems for the Wave Equation and Equations of Mixed Type",
   journal = "Indiana Univ. Math. J.",
  fjournal = "Indiana University Mathematics Journal",
    volume = 3,
      year = 1954,
     issue = 4,
     pages = "435--446",
      issn = "0022-2518",
     coden = "IUMJAB",
   mrclass = "",
}

amsrefs

\bib{iumj53022}{article}{
     author = {Protter, M.},
      title = {New Boundary Value Problems for the Wave Equation and Equations of Mixed Type},
    journal = {Indiana Univ. Math. J.},
     volume = {3},
       year = {1954},
     number = {4},
      pages = {435 \ndash 446},
}