https://www.nejm.org/doi/full/10.1056/NEJMoa2027540?casa_token=OI_4It-jhqkAAAAA:TBaFHaU8EhUfquTWzpieXBP92EzwO5Apd68LKLklLHTxXodTM_doFSlBe6mYK897gSl8U8dcjOFP1Umb
https://sj.jst.go.jp/stories/2021/s0804-01j.html
https://cointelegraph.com/ethereum-for-beginners/ethereum-upgrades-a-beginners-guide-to-eth-2-0