AKBAR ALI SHAH; M. ALEEM. Estimating Income Variances by Probability Sampling: A Case Study. Pakistan Journal of Commerce and Social Sciences, [S. l.], v. 4, n. 2, p. 194–201, 2010. Disponível em: https://jes.ac.pk/index.php/jes/article/view/633. Acesso em: 2 nov. 2026.