@article{MET_1961__4_175114,
     author = {L. Michel},
     title = {Zum {Problem} der numerischen {Bestimmung} der {Niveau-Eigenschaften} eines psychologischen {Tests.}},
     journal = {Metrika},
     pages = {230--236},
     publisher = {mathdoc},
     volume = {4},
     year = {1961},
     zbl = {0103.12702},
     url = {http://geodesic.mathdoc.fr/item/MET_1961__4_175114/}
}