Submitted on: 07 November 1999.
Revised on: 12 February 2000.
Accepted on: 25 March 2000.
___________________Journal of Fixed Point Theory and Applications
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Submitted on: 19 September 1998.
Revised on: 19 November 1998.
Accepted on: 08 January 1999.
___________________Journal of Fixed Point Theory and Applications
Submitted on: 01 January 2015.
Revised on: 20 February 2015.
Accepted on: 09 March 2015.
___________________Journal of Fixed Point Theory and Applications