div.abstract {
  text-align: justify;
}


ul.authors, ul.versions, ul.versions ul {
  list-style-type: none; margin: 0; padding: 0;
}

ul.versions, div.reference { margin-top: 1.5em; }

h2, ul.authors {
  text-align: center;
}

ul.authors {
  margin-bottom: 1.5em;
}