@article{ELMA_1968__23_140904,
     author = {Francois Fricker},
     title = {Eine {Bemerkung} zur {Untersuchung} unbestimmter {Ausdr\"ucke.}},
     journal = {Elemente der Mathematik},
     pages = {132--135},
     publisher = {mathdoc},
     volume = {23},
     year = {1968},
     zbl = {0174.34802},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1968__23_140904/}
}