www.taxathand.com/article/11580/Brazil/2019/New-disclosure-requirement-introduced-for-crypto-asset-transactions-
www.mayerbrown.com/en/perspectives-events/publications/2019/05/brazilian-irs-normative-ruling-no-18882019-regulates-the-declaration-of-transactions-with-cryptocurrencies
tozzinifreire.com.br/boletins/receita-federal-cria-nova-obrigacao-acessoria-para-operacoes-com-criptoativos
www.coindesk.com/brazilian-tax-authorities-impose-new-requirements-on-crypto-trading
normas.receita.fazenda.gov.br/sijut2consulta/link.action?visao=anotado&idAto=100592