@article{ELMA_1970__25_140957,
     author = {Daniel Pedoe},
     title = {The {Missing} {Seventh} {Circle.}},
     journal = {Elemente der Mathematik},
     pages = {14--15},
     publisher = {mathdoc},
     volume = {25},
     year = {1970},
     zbl = {0941.51501},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1970__25_140957/}
}