Our friends at ScrumGenius built and maintain this integration -- you can find their documentation for setting it up here.
Updated
<% if (previousArticle) { %>
<% } %>
<% if (items.length > 1) { %>
<% if (previousTitle) { %>
<% } %>
<% if (nextArticle) { %>
<%= previousTitle %>
<% } %> <%= previousArticle.title %>
<% if (nextTitle) { %>
<% } %>