@article{ELMA_1954__9_140601,
     author = {George Adams},
     title = {Conchoid and {Negative} {Circle.} {(Continued).}},
     journal = {Elemente der Mathematik},
     pages = {9--16},
     publisher = {mathdoc},
     volume = {9},
     year = {1954},
     zbl = {0057.36501},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1954__9_140601/}
}