@article{MZ_1966__91_170504,
     author = {Johannes K\"ohn},
     title = {Die {Harnacksche} {Metrik} in der {Theorie} der harmonischen {Funktionen.}},
     journal = {Mathematische Zeitschrift},
     pages = {50--64},
     publisher = {mathdoc},
     volume = {91},
     year = {1966},
     zbl = {0163.14204},
     url = {http://geodesic.mathdoc.fr/item/MZ_1966__91_170504/}
}