PHILIPPOPOULOS, P.; RICOTTONE, A.; G. OLIVER, C. Difficulty Scaling in Proof of Work for Decentralized Problem Solving. Ledger, [S. l.], v. 5, 2020. DOI: 10.5195/ledger.2020.194. Disponível em: https://ledgerjournal.org/ojs/ledger/article/view/194. Acesso em: 25 sep. 2022.