Add the possibility to find (and easily add) papers that cite or are cited by a a given paper (or a couple of paper).

Here are a bunch of links that might be relevant/helpful:

• http://api.semantischolar.org/
• https://opencitations.net/index/api/v1
• http://citationgecko.com/
• https://www.yewno.com/discover
• https://openknowledgemaps.org/
• http://wikicite.org/
• https://www.scholarcy.com/
• https://www.dimensions.ai/dimensions-apis/
• https://www.springernature.com/gp/researchers/bookmetrix
• (https://github.com/adsabs/adsabs-dev-api)