Submitted on: 31 January 2022.
Revised on: 01 March 2022.
Accepted on: 13 March 2022.
Proceedings of the Institute of Mathematics and Mechanics
Submitted on: 21 August 2005.
Revised on: 26 September 2005.
Accepted on: 07 October 2005.
Proceedings of the Institute of Mathematics and Mechanics
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http://reply.papertrans.cn/3/253/25285/25285-34.png
Submitted on: 26 July 2014.
Revised on: 07 September 2014.
Accepted on: 29 September 2014.
Proceedings of the Institute of Mathematics and Mechanics
Submitted on: 08 December 2019.
Revised on: 21 January 2020.
Accepted on: 30 January 2020.
Proceedings of the Institute of Mathematics and Mechanics