@article {chen1993empirical,
	title = {Empirical likelihood estimation for finite populations and the effective usage of auxiliary information},
	journal = {Biometrika},
	volume = {80},
	number = {1},
	year = {1993},
	pages = {107{\textendash}116},
	publisher = {Oxford University Press},
	author = {Chen, Jiahua and Qin, Jing}
}
