@article{JDM_1934__43_145998,
     author = {Alexander Aigner},
     title = {\"Uber die {M\"oglichkeit} von x4 + y4 = z4 in quadratischen {K\"orpern.}},
     journal = {Jahresbericht der Deutschen Mathematiker-Vereinigung},
     pages = {226--229},
     publisher = {mathdoc},
     volume = {43},
     year = {1934},
     zbl = {0008.29502},
     url = {http://geodesic.mathdoc.fr/item/JDM_1934__43_145998/}
}