Submitted on: 16 December 2017.
Revised on: 09 March 2018.
Accepted on: 28 April 2018.
___________________DIFFERENTIAL EQUATIONS---PLEIADES PUBLISHING INC
Submitted on: 15 February 2005.
Revised on: 14 May 2005.
Accepted on: 30 June 2005.
___________________DIFFERENTIAL EQUATIONS---PLEIADES PUBLISHING INC
Submitted on: 12 September 2003.
Revised on: 04 October 2003.
Accepted on: 23 November 2003.
___________________DIFFERENTIAL EQUATIONS---PLEIADES PUBLISHING INC
http://reply.papertrans.cn/1/75/7451/7451-14.png
http://reply.papertrans.cn/1/75/7451/7451-15.png
http://reply.papertrans.cn/1/75/7451/7451-16.png
Submitted on: 24 January 2019.
Revised on: 30 March 2019.
Accepted on: 02 May 2019.
___________________DIFFERENTIAL EQUATIONS---PLEIADES PUBLISHING INC
Submitted on: 21 September 2021.
Revised on: 29 November 2021.
Accepted on: 20 January 2022.
___________________DIFFERENTIAL EQUATIONS---PLEIADES PUBLISHING INC
http://reply.papertrans.cn/1/75/7451/7451-19.png
Submitted on: 01 February 2018.
Revised on: 10 March 2018.
Accepted on: 28 March 2018.
___________________DIFFERENTIAL EQUATIONS---PLEIADES PUBLISHING INC