Geodesic
On Singular Points of Normal Arcs of Cyclic Order Four
Canadian mathematical bulletin, Tome 17 (1974) no. 3, pp. 391-396

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In [5] N. D. Lane and P. Scherk discuss arcs in the conformai (inversive) plane which are met by every circle at not more than three points; i.e., arcs of cyclic order three. This paper is concerned with the analysis of normal arcs of cyclic order four in the conformai plane. 
Spoar, G.; Lane, N. D. On Singular Points of Normal Arcs of Cyclic Order Four. Canadian mathematical bulletin, Tome 17 (1974) no. 3, pp. 391-396. doi: 10.4153/CMB-1974-072-2
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