@article{ELMA_1977__32_141188,
     author = {A. Zbinden},
     title = {\"Uberdeckung eiens {Quadrates} durch 6 kongruente {Kreise.}},
     journal = {Elemente der Mathematik},
     pages = {25--32},
     publisher = {mathdoc},
     volume = {32},
     year = {1977},
     zbl = {0353.52007},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1977__32_141188/}
}