https://www.stateofspeed.com/2020/07/07/the-wankel-rotary-a-revolution-in-internal-cumbustion-2/
https://engineering.fandom.com/wiki/Wankel_engine
https://en.wikipedia.org/wiki/Wankel_engine#History
https://www.quora.com/What-is-otto-cycle
https://www.rx7club.com/3rd-generation-specific-1993-2002-16/apex-seal-material-957087/
https://www.hagerty.com/media/automotive-history/engine-revolution-mazdas-rotary-and-its-uncertain-future/