@misc{WM_1901_5_1-2-3_a6,
     title = {Wzory przybli\.zone na \ensuremath{\sqrt{}}(a2+b2) i \ensuremath{\sqrt{}}(a2-b2)},
     journal = {Wiadomo\'sci Matematyczne},
     pages = {67--72},
     publisher = {mathdoc},
     volume = {5},
     number = {1-2-3},
     year = {1901},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/item/WM_1901_5_1-2-3_a6/}
}