Detection of covid-19 epidemic waves and their interrelationships in the tri-border region between Brazil, Paraguay, and Argentina, 2020-2023: Covid-19 epidemic waves in the tri-border region. SciELO Preprints, 2024. DOI: 10.1590/SciELOPreprints.10963. Disponível em: https://preprints.scielo.org/index.php/scielo/preprint/view/10963. Acesso em: 9 jun. 2026.