Chased By a Lion and other Pursuit Problems

I am looking for a reference (book or article) that poses a problem that seems to be a classic, in that I’ve heard it posed many times, but that I’ve never seen written anywhere: that of the possibility of a man in a circular pen with a lion, each with some maximum speed, avoiding capture by that lion.

References to these sprts of pursuit problems in general would also be appreciated, and the original source of this problem.

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