@article{10_21136_CPM_1959_117317,
     author = {H\'ajek, Jaroslav},
     title = {Optimal strategy and other problems in probability sampling},
     journal = {\v{C}asopis pro p\v{e}stov\'an{\'\i} matematiky},
     pages = {387--423},
     year = {1959},
     volume = {84},
     number = {4},
     doi = {10.21136/CPM.1959.117317},
     mrnumber = {0121897},
     zbl = {0138.13301},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CPM.1959.117317/}
}