* William A. Kirk and Brailey Sims, Handbook of Metric Fixed Point Theory ( 2001 ), Kluwer Academic, London ISBN 0-7923-7073-2
* William A. Kirk and Brailey Sims, Handbook of Metric Fixed Point Theory ( 2001 ), Kluwer Academic, London ISBN 0-7923-7073-2.
* William A. Kirk and Brailey Sims, Handbook of Metric Fixed Point Theory ( 2001 ), Kluwer Academic, London ISBN 0-7923-7073-2
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