   if (!front_matter.doi) {
        // if we have a citation and valid citationText then link to that
        if ($('#citation').length > 0 && front_matter.citationText) {
          doi.html('Citation');
          $('<a href="#citation"></a>')
            .text(front_matter.citationText)
            .appendTo(doi_p);
        } else {
          hide_byline_column("DOI");
        }
      } else {
        $('<a></a>')
           .attr('href', "https://doi.org/" + front_matter.doi)
           .html(front_matter