@article{MAN_1939__116_159992,
     author = {W. Pich},
     title = {\"Uber die {Strenge} vollst\"andiger {Systeme} von {Gruppenpostulaten}},
     journal = {Mathematische Annalen},
     pages = {51--57},
     year = {1939},
     volume = {116},
     zbl = {64.0053.01},
     url = {http://geodesic.mathdoc.fr/item/MAN_1939__116_159992/}
}