@article{10_4064_am_4_2_169_175,
     author = {A. Pluci\'nska},
     title = {Wariancja \'sredniej w pewnym schemacie losowania},
     journal = {Applicationes Mathematicae},
     pages = {169--175},
     publisher = {mathdoc},
     volume = {4},
     number = {2},
     year = {1959},
     doi = {10.4064/am-4-2-169-175},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/am-4-2-169-175/}
}