Articles with coauthors show up multiple times

[i-am-david-liu]

Describe the bug Articles with coauthors show up multiple times in "related articles" section.

To Reproduce Go to an article with multiple authors and check the "related articles" section.

Expected behavior Articles with coauthors should only show up once.

Screenshots From https://poly.rpi.edu/news/2019/10/family-weekend-closes-with-gm-pu-brunch/