### The Pulfrich Effect: Nickalls' Theorem (2000)

Nickalls, R. W. D. A conic theorem generalised: directed
angles and applications. *The Mathematical Gazette*,
2000, **84**, pp. 232 - 241.

This paper presents a new proof of Nickalls' Theorem, generalizing
it to directed angles and to all possible arrangements of the line
and conic.

A full-text PDF copy of this article may be downloaded from the
publisher's site, using an
external link.

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The Pulfrich Effect, SIU-C. Last updated 2000-12-29