@article{MET_1959__2_175050,
     author = {J. Rybarz},
     title = {Ein einfacher {Beweis} f\"ur das dem {X2-Verfahren} zugrundeliegende {Theorem.}},
     journal = {Metrika},
     pages = {89--93},
     publisher = {mathdoc},
     volume = {2},
     year = {1959},
     zbl = {0086.12603},
     url = {http://geodesic.mathdoc.fr/item/MET_1959__2_175050/}
}