@article{MZ_1919__5_167553,
     author = {S., Wigert},
     title = {\"Uber das {Problem} der {Gitterpunkte} in einem {Kreise}},
     journal = {Mathematische Zeitschrift},
     pages = {310--318},
     year = {1919},
     volume = {5},
     zbl = {47.0157.02},
     url = {http://geodesic.mathdoc.fr/item/MZ_1919__5_167553/}
}