@article{ELMA_1985__40_141356,
     author = {K. Johnsen and Ch. Albrechts},
     title = {Lineare {Abh\"angigkeiten} von {Einheitswurzeln.}},
     journal = {Elemente der Mathematik},
     pages = {57--59},
     year = {1985},
     volume = {40},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1985__40_141356/}
}