BibTeX

@ARTICLE{iumj15026,
    author = "Richard Arens",
     title = "Invaraint Sublogics as a Way from Scalar to Many-Component Wave Equations",
   journal = "Indiana Univ. Math. J.",
  fjournal = "Indiana University Mathematics Journal",
    volume = 15,
      year = 1966,
     issue = 3,
     pages = "349--371",
      issn = "0022-2518",
     coden = "IUMJAB",
   mrclass = "",
}

amsrefs

\bib{iumj15026}{article}{
     author = {Arens, Richard},
      title = {Invaraint Sublogics as a Way from Scalar to Many-Component Wave Equations},
    journal = {Indiana Univ. Math. J.},
     volume = {15},
       year = {1966},
     number = {3},
      pages = {349 \ndash 371},
}