@article{ELMA_1951__6_140562,
     author = {E. Trost},
     title = {Beweis einer {Minimaleigenschaft} des {Quadrates.}},
     journal = {Elemente der Mathematik},
     pages = {26--28},
     publisher = {mathdoc},
     volume = {6},
     year = {1951},
     zbl = {0042.16502},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1951__6_140562/}
}