Larry Niven,

A World out of Time , Macdonald & Jane’s, London, 1977

Igor Novikov,

The River of Time , Cambridge University Press, 1998

Clifford Pickover,

Time: A Traveller’s Guide , Oxford University Press, 1999

Fred Pohl and Cyril Kornbluth,

Wolfbane , Ballantine, NewYork, 1959

Fred Pohl,

The Coming of the Quantum Cats , Bantam, NewYork, 1986

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