BibTeX

@ARTICLE{iumj42051,
    author = "Ralph Artino and J. Barros-Neto",
     title = "The Factorization of Hypoelliptic Pseudodifferential Operators",
   journal = "Indiana Univ. Math. J.",
  fjournal = "Indiana University Mathematics Journal",
    volume = 42,
      year = 1993,
     issue = 4,
     pages = "1101--1120",
      issn = "0022-2518",
     coden = "IUMJAB",
   mrclass = "",
}

amsrefs

\bib{iumj42051}{article}{
     author = {Artino, Ralph},
     author = {Barros-Neto, J.},
      title = {The Factorization of Hypoelliptic Pseudodifferential Operators},
    journal = {Indiana Univ. Math. J.},
     volume = {42},
       year = {1993},
     number = {4},
      pages = {1101 \ndash 1120},
}