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References
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1.Graham, R.Lararias, J. C.Mallows, C. L.Wilks, A. R.Tan, C. H.Apollonian circle packings: number theory, Journal of Number Theory100 (2003) pp. 1–45. (A misprint in the abstract quoted has been corrected.)Google Scholar
3.Bradley, Christopher J.Heron triangles and touching circles, Math. Gaz. 87 (March 2003) pp. 36–41.CrossRefGoogle Scholar
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4. The author has chosen what he considers the most interesing properties of the set (0, 0, 1, 1) and made them the subject of a 6-part problem suitable for sixth-formers. He is happy to supply this gratis in hard copy.Google Scholar