Submitted on: 21 August 2013.
Revised on: 08 November 2013.
Accepted on: 02 January 2014.
___________________Journal of Nonlinear and Convex Analysis
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Submitted on: 01 April 1998.
Revised on: 03 May 1998.
Accepted on: 08 June 1998.
___________________Journal of Nonlinear and Convex Analysis
Submitted on: 14 February 2010.
Revised on: 10 June 2010.
Accepted on: 25 July 2010.
___________________Journal of Nonlinear and Convex Analysis