@article{10_4064_am28_1_5,
     author = {Wojciech Niemiro and Jacek Weso/lowski},
     title = {Fixed precision optimal allocation
in two-stage sampling},
     journal = {Applicationes Mathematicae},
     pages = {73--82},
     publisher = {mathdoc},
     volume = {28},
     number = {1},
     year = {2001},
     doi = {10.4064/am28-1-5},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/am28-1-5/}
}