@article{ELMA_1953__8_140599,
     author = {George Adams},
     title = {Conchoid and {Negative} {Circle.}},
     journal = {Elemente der Mathematik},
     pages = {129--136},
     publisher = {mathdoc},
     volume = {8},
     year = {1953},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1953__8_140599/}
}