BibTeX

@ARTICLE{iumj59045,
    author = "Vaiclav Hlavaty",
     title = "Proper Time, Apparent time, and Formal Time in the Twin Paradox",
   journal = "Indiana Univ. Math. J.",
  fjournal = "Indiana University Mathematics Journal",
    volume = 9,
      year = 1960,
     issue = 5,
     pages = "733--744",
      issn = "0022-2518",
     coden = "IUMJAB",
   mrclass = "",
}

amsrefs

\bib{iumj59045}{article}{
     author = {Hlavaty, Vaiclav},
      title = {Proper Time, Apparent time, and Formal Time in the Twin Paradox},
    journal = {Indiana Univ. Math. J.},
     volume = {9},
       year = {1960},
     number = {5},
      pages = {733 \ndash 744},
}