Emergency contracting to purchase goods and services needed to deal with COVID-19: considerations on article 4 of Law No. 13.979/2020. Rev-TRF3 [Internet]. 2020 Dec. 10 [cited 2026 Aug. 12];31(147):15-36. Available from: https://revista.trf3.jus.br/index.php/rtrf3/article/view/231