BibTeX

@ARTICLE{iumj11039,
    author = "R. Gunning",
     title = "Generalized Symplectic Differential Forms and Differential Operators",
   journal = "Indiana Univ. Math. J.",
  fjournal = "Indiana University Mathematics Journal",
    volume = 11,
      year = 1962,
     issue = 5,
     pages = "703--723",
      issn = "0022-2518",
     coden = "IUMJAB",
   mrclass = "",
}

amsrefs

\bib{iumj11039}{article}{
     author = {Gunning, R.},
      title = {Generalized Symplectic Differential Forms and Differential Operators},
    journal = {Indiana Univ. Math. J.},
     volume = {11},
       year = {1962},
     number = {5},
      pages = {703 \ndash 723},
}