@article{MAN_1956__131_160492,
     author = {P. Thullen},
     title = {\"Uber das {Konvergenzproblem} der relativen {H\"aufigkeiten} in der {Wahrscheinlichkeitstheorie.}},
     journal = {Mathematische Annalen},
     pages = {346--353},
     publisher = {mathdoc},
     volume = {131},
     year = {1956},
     zbl = {0072.34201},
     url = {http://geodesic.mathdoc.fr/item/MAN_1956__131_160492/}
}