@article{MET_1966__10_175281,
     author = {U.P. Beck},
     title = {Ein optisches {Analogieger\"at} f\"ur den tetrachorischen {Korrelationskoeffizienten}},
     journal = {Metrika},
     pages = {46--51},
     publisher = {mathdoc},
     volume = {10},
     year = {1966},
     url = {http://geodesic.mathdoc.fr/item/MET_1966__10_175281/}
}