@article{10_4064_am_3_2_164_181,
     author = {J. Perkal},
     title = {O populacjach ruchomych},
     journal = {Applicationes Mathematicae},
     pages = {164--181},
     publisher = {mathdoc},
     volume = {3},
     number = {2},
     year = {1958},
     doi = {10.4064/am-3-2-164-181},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/am-3-2-164-181/}
}