@book{53536,
	author = {Van Beeck, J G and Vermetten, J B},
	title = {Application of the theory of sampling with probabilities proportional to size on industrial surveys},
	publisher = {Central Planning Bureau},
	year = {1966},
	address = {The Hague},
	note = {This article appeared in "Applied statistics". vol. xv: no.2}
}