BibTeX

@ARTICLE{iumj18086,
    author = "J. Lagnese",
     title = "The Structure of a Class of Huygens' Operators*",
   journal = "Indiana Univ. Math. J.",
  fjournal = "Indiana University Mathematics Journal",
    volume = 18,
      year = 1969,
     issue = 12,
     pages = "1195--1201",
      issn = "0022-2518",
     coden = "IUMJAB",
   mrclass = "",
}

amsrefs

\bib{iumj18086}{article}{
     author = {Lagnese, J.},
      title = {The Structure of a Class of Huygens' Operators*},
    journal = {Indiana Univ. Math. J.},
     volume = {18},
       year = {1969},
     number = {12},
      pages = {1195 \ndash 1201},
}