GANEM, A.; TAYOUB, M. Experimental study for estimating of Variance mean in optimum stratified sampling . Latakia University Journal - Economic and Legal Sciences Series, [S. l.], v. 24, n. 1, 2019. Disponível em: https://journal.tishreen.edu.sy/index.php/econlaw/article/view/8062. Acesso em: 29 apr. 2025.