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Submitted on: 16 November 2016.
Revised on: 18 December 2016.
Accepted on: 05 January 2017.
SIAM JOURNAL ON NUMERICAL ANALYSIS
Submitted on: 23 April 2017.
Revised on: 12 May 2017.
Accepted on: 29 May 2017.
SIAM JOURNAL ON NUMERICAL ANALYSIS
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