http://reply.papertrans.cn/1/19/1839/1839-31.png
http://reply.papertrans.cn/1/19/1839/1839-32.png
Submitted on: 03 January 2010.
Revised on: 03 February 2010.
Accepted on: 18 February 2010.
___________________Annals of PDE---SPRINGERNATURE
Submitted on: 21 January 2010.
Revised on: 21 February 2010.
Accepted on: 16 April 2010.
___________________Annals of PDE---SPRINGERNATURE
http://reply.papertrans.cn/1/19/1839/1839-35.png
Submitted on: 20 September 2019.
Revised on: 19 November 2019.
Accepted on: 16 December 2019.
___________________Annals of PDE---SPRINGERNATURE