SACCO, Giuseppina; SACCO, Pietro. The Valency Of The Natural And Social Components As Determinants Of A Population’s Future Development. European Scientific Journal, ESJ, [S. l.], v. 12, n. 8, p. 284, 2016. DOI: 10.19044/esj.2016.v12n8p284. Disponível em: https://test.eujournal.org/index.php/esj/article/view/7165. Acesso em: 18 apr. 2025.