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Published online by Cambridge University Press: 03 November 2016
page no 271 note * Bekur, H.F, Principles of Geometry, Vol. 11, pp. 42–44 ;Google Scholaror Green, H.G. , Mathematical Gazette, Vol. 28, NO. 278, p. 3, where the case of degeneracy is con. sidered ina much simpler manner.Google Scholar
page no 278 note † By (1, 1) correspondence, or by projecting the conics concerned into circles.