How would I properly show articles for each author in this example

{% for authors in articles.authors %}
<li title="{{authors.title}}"><a href="#">&larr;{{authors}}</a>
<ul class="dl-submenu">
{% for category in articles|groupby('category') %}
<li><a href="#" style="text-transform: capitalize;">&rarr;{{category.grouper}} </a>
<ul class="dl-submenu">
{% for article in category.list %}
<li><a href="{{SITEURL}}/{{article.url}}">{{article.title}}</a></li>
{% endfor %}
</ul>
</li>
{% endfor %}
</ul>
</li>
{% endfor %}


my example doesn't output anything in the menu