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@article{AM2_1985__29_137100, author = {Tzen-Ping Liu and M.E. Thompson}, title = {A problem arising in finite population sampling theory.}, journal = {Aequationes mathematicae}, pages = {307--312}, publisher = {mathdoc}, volume = {29}, year = {1985}, zbl = {0584.62010}, url = {http://geodesic.mathdoc.fr/item/AM2_1985__29_137100/} }
Tzen-Ping Liu; M.E. Thompson. A problem arising in finite population sampling theory.. Aequationes mathematicae, Tome 29 (1985), pp. 307-312. http://geodesic.mathdoc.fr/item/AM2_1985__29_137100/