@article{MM2_1975__15_154323,
     author = {J\"urgen T\"olke},
     title = {Elementare {Kennzeichnungen} der symmetrischen {Schrotung.}},
     journal = {Manuscripta mathematica},
     pages = {309--322},
     publisher = {mathdoc},
     volume = {15},
     year = {1975},
     zbl = {0319.53013},
     url = {http://geodesic.mathdoc.fr/item/MM2_1975__15_154323/}
}