SAMOJLUK, Artur; NOWAK, Bartosz; PAPIERNIK, Karolina. Measuring sadness index based on country statistics. Technical Sciences, [S. l.], v. 25, p. 193–203, 2023. DOI: 10.31648/ts.8571. Disponível em: https://czasopisma.uwm.edu.pl/index.php/ts/article/view/8571. Acesso em: 15 nov. 2026.