Citations page should include URLs/DOIs

[bdice]

The Citations page should include URLs and DOIs so that readers can more easily find and read the cited articles. I had a bit of a hard time finding the paper published in Information. Feel free to assign me - I'm creating the issue so that I don't forget to do this later.

Here are the URLs to include.

• https://www.mdpi.com/2078-2489/11/4/193/htm, DOI 10.3390/info11040193
• https://arxiv.org/abs/2008.00325 https://ojs.aaai.org/index.php/AAAI/article/view/16118