@article{ELMA_1967__22_140832,
     author = {O. Giering},
     title = {Ein mechanisches {Modell} zur {L\"osung} gewisser {Extremalaufgaben.}},
     journal = {Elemente der Mathematik},
     pages = {5--11},
     publisher = {mathdoc},
     volume = {22},
     year = {1967},
     zbl = {0144.44202},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1967__22_140832/}
}