https://papers.ssrn.com/sol3/papers.cfm?abstract_id=5306676

https://papers.ssrn.com/sol3/papers.cfm?abstract_id=5306386

https://community.king.com/en/profile/2712508/How%20do%20I%20make%20a%20call%20on%20Robinhood%3F%20%7B%7Bcall~now%7D%7D

https://papers.ssrn.com/sol3/papers.cfm?abstract_id=5306764

https://papers.ssrn.com/sol3/papers.cfm?abstract_id=5306450

https://papers.ssrn.com/sol3/papers.cfm?abstract_id=5306602

https://papers.ssrn.com/sol3/papers.cfm?abstract_id=5306676

https://support.npe.fit/hc/en-us/community/posts/38533897067028-What-is-the-way-to-talk-directly-on-Robinhood-talk-now

https://support.npe.fit/hc/en-us/community/posts/38533920066324-How-do-I-get-in-touch-with-Robinhood-s-support-team-get-call

https://support.npe.fit/hc/en-us/community/posts/38533928037908-How-do-I-speak-directly-to-Robinhood-speak-call