@misc{WM_1901_5_4-5-6_a2,
     title = {O wieku ziemi},
     journal = {Wiadomo\'sci Matematyczne},
     pages = {158--178},
     publisher = {mathdoc},
     volume = {5},
     number = {4-5-6},
     year = {1901},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/item/WM_1901_5_4-5-6_a2/}
}