CECCHETTI, Paola. Introduction. Direct observation. Gruppi - Open Access, [S. l.], n. 1, 2026. DOI: 10.3280/gruoa1-2025oa23407. Disponível em: https://journals.francoangeli.it/index.php/gruoa/article/view/23407. Acesso em: 8 nov. 2026.