@article{JDM_1918__27_145541,
     author = {Wilhelm Blaschke},
     title = {Mittelwerts\"atze der {Potentialtheorie.}},
     journal = {Jahresbericht der Deutschen Mathematiker-Vereinigung},
     pages = {157--160},
     publisher = {mathdoc},
     volume = {27},
     year = {1918},
     zbl = {46.0742.02},
     url = {http://geodesic.mathdoc.fr/item/JDM_1918__27_145541/}
}