@article{JRAM_1940__182_150077,
     author = {P. Lorenzen},
     title = {Ein vereinfachtes {Axiomensystem} f\"ur {Gruppen.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {50--50},
     year = {1940},
     volume = {182},
     zbl = {66.0066.01},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1940__182_150077/}
}