@article{MAN_1937__113_159864,
     author = {H. Richter},
     title = {Ein {Beweis} der {Relationen} von {Vahlen}},
     journal = {Mathematische Annalen},
     pages = {CCVI--CCVII},
     year = {1937},
     volume = {113},
     zbl = {62.0076.03},
     url = {http://geodesic.mathdoc.fr/item/MAN_1937__113_159864/}
}