BibTeX

@ARTICLE{iumj22063,
    author = "Walter Roth",
     title = "Goursat Problems for $u_{rs} = Lu$",
   journal = "Indiana Univ. Math. J.",
  fjournal = "Indiana University Mathematics Journal",
    volume = 22,
      year = 1973,
     issue = 8,
     pages = "779--788",
      issn = "0022-2518",
     coden = "IUMJAB",
   mrclass = "",
}

amsrefs

\bib{iumj22063}{article}{
     author = {Roth, Walter},
      title = {Goursat Problems for $u_{rs} = Lu$},
    journal = {Indiana Univ. Math. J.},
     volume = {22},
       year = {1973},
     number = {8},
      pages = {779 \ndash 788},
}