@article{MET_1960__3_175071,
     author = {S.S. Zarkovic},
     title = {On the {Efficiency} of {Sampling} with {Varying} {Probabilities} and the {Selection} of {Units} with {Replacement.}},
     journal = {Metrika},
     pages = {53--60},
     publisher = {mathdoc},
     volume = {3},
     year = {1960},
     zbl = {0099.14301},
     url = {http://geodesic.mathdoc.fr/item/MET_1960__3_175071/}
}