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Submitted on: 08 June 2017.
Revised on: 19 September 2017.
Accepted on: 27 October 2017.
___________________Annals of PDE---SPRINGERNATURE
Submitted on: 09 February 2016.
Revised on: 03 May 2016.
Accepted on: 03 June 2016.
___________________Annals of PDE---SPRINGERNATURE
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Submitted on: 01 October 2022.
Revised on: 27 January 2023.
Accepted on: 01 March 2023.
___________________Annals of PDE---SPRINGERNATURE
Submitted on: 03 December 2002.
Revised on: 16 January 2003.
Accepted on: 01 February 2003.
___________________Annals of PDE---SPRINGERNATURE
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Submitted on: 20 January 2014.
Revised on: 03 May 2014.
Accepted on: 30 May 2014.
___________________Annals of PDE---SPRINGERNATURE
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