@article{MAN_1924__91_159048,
     author = {T. Bonnesen},
     title = {\"Uber das isoperimetrische {Defizit} ebener {Figuren}},
     journal = {Mathematische Annalen},
     pages = {252--268},
     publisher = {mathdoc},
     volume = {91},
     year = {1924},
     zbl = {50.0487.03},
     url = {http://geodesic.mathdoc.fr/item/MAN_1924__91_159048/}
}