BibTeX

@ARTICLE{iumj22069,
    author = "Constantin Apostol",
     title = "Quasitriangularity in Hilbert Space",
   journal = "Indiana Univ. Math. J.",
  fjournal = "Indiana University Mathematics Journal",
    volume = 22,
      year = 1973,
     issue = 9,
     pages = "817--825",
      issn = "0022-2518",
     coden = "IUMJAB",
   mrclass = "",
}

amsrefs

\bib{iumj22069}{article}{
     author = {Apostol, Constantin},
      title = {Quasitriangularity in Hilbert Space},
    journal = {Indiana Univ. Math. J.},
     volume = {22},
       year = {1973},
     number = {9},
      pages = {817 \ndash 825},
}