BibTeX

@ARTICLE{iumj12023,
    author = "Avner Friedman",
     title = "Existence of Smooth Solutions of the Cauchy Problem for Differential Systems of any Type",
   journal = "Indiana Univ. Math. J.",
  fjournal = "Indiana University Mathematics Journal",
    volume = 12,
      year = 1963,
     issue = 3,
     pages = "335--374",
      issn = "0022-2518",
     coden = "IUMJAB",
   mrclass = "",
}

amsrefs

\bib{iumj12023}{article}{
     author = {Friedman, Avner},
      title = {Existence of Smooth Solutions of the Cauchy Problem for Differential Systems of any Type},
    journal = {Indiana Univ. Math. J.},
     volume = {12},
       year = {1963},
     number = {3},
      pages = {335 \ndash 374},
}