SINGH, G. N.; KHALID, M. Exponential chain dual to ratio and regression type estimators of population mean in two-phase sampling. Statistica, [S. l.], v. 75, n. 4, p. 379–389, 2015. DOI: 10.6092/issn.1973-2201/5423. Disponível em: https://rivista-statistica.unibo.it/article/view/5423. Acesso em: 1 feb. 2023.