BibTeX

@ARTICLE{iumj2022,
    author = "R. Gardner and N. Kamran",
     title = "Normal forms and focal systems for determined systems of two first-order partial differential equations",
   journal = "Indiana Univ. Math. J.",
  fjournal = "Indiana University Mathematics Journal",
    volume = 44,
      year = 1995,
     issue = 4,
     pages = "1127--1162",
      issn = "0022-2518",
     coden = "IUMJAB",
   mrclass = "",
}

amsrefs

\bib{iumj2022}{article}{
     author = {Gardner, R.},
     author = {Kamran, N.},
      title = {Normal forms and focal systems for determined systems of two first-order partial differential equations},
    journal = {Indiana Univ. Math. J.},
     volume = {44},
       year = {1995},
     number = {4},
      pages = {1127 \ndash 1162},
}