@article{AM2_1969__2_182354,
     author = {V. HAVEL},
     title = {Endomorphismen von ebenen {Viergeweben} {(Beitrag} zu einem {Problem} von {J.} {Aczel)} {(Short} {Communication)}},
     journal = {Aequationes mathematicae},
     pages = {398--400},
     publisher = {mathdoc},
     volume = {2},
     year = {1969},
     url = {http://geodesic.mathdoc.fr/item/AM2_1969__2_182354/}
}