>
<li class="nav-item"><a class="external-link nav-link" href="https://github.com/pgomba/MDPI_explorer" aria-label="Github"><span class="fa fa-github"></span></a></li>
<li class="nav-item"><form class="form-inline" role="search">
 <input class="form-control" type="search" name="search-input" id="search-input" autocomplete="off" aria-label="Search site" placeholder="Search for" data-search-index="../search.json">
</form></li>
<li class="nav-item dropdown">
  <button class="nav-link dropdown-toggle" type="but