BibTeX

@ARTICLE{iumj40004,
    author = "P. D'Ancona and S. Spagnolo",
     title = "On the Life Span of the Analytic Solutions to Quasilinear Weakly Hyperbolic Equations",
   journal = "Indiana Univ. Math. J.",
  fjournal = "Indiana University Mathematics Journal",
    volume = 40,
      year = 1991,
     issue = 1,
     pages = "71--99",
      issn = "0022-2518",
     coden = "IUMJAB",
   mrclass = "",
}

amsrefs

\bib{iumj40004}{article}{
     author = {D'Ancona, P.},
     author = {Spagnolo, S.},
      title = {On the Life Span of the Analytic Solutions to Quasilinear Weakly Hyperbolic Equations},
    journal = {Indiana Univ. Math. J.},
     volume = {40},
       year = {1991},
     number = {1},
      pages = {71 \ndash 99},
}