Submitted on: 30 May 2018.
Revised on: 10 July 2018.
Accepted on: 20 July 2018.
RUSSIAN JOURNAL OF MATHEMATICAL PHYSICS
Submitted on: 06 September 1998.
Revised on: 15 September 1998.
Accepted on: 07 October 1998.
RUSSIAN JOURNAL OF MATHEMATICAL PHYSICS
http://reply.papertrans.cn/3/274/27390/27390-33.png
Submitted on: 25 January 2003.
Revised on: 25 February 2003.
Accepted on: 17 March 2003.
RUSSIAN JOURNAL OF MATHEMATICAL PHYSICS
Submitted on: 18 October 2021.
Revised on: 29 October 2021.
Accepted on: 14 November 2021.
RUSSIAN JOURNAL OF MATHEMATICAL PHYSICS
Submitted on: 08 April 2015.
Revised on: 16 May 2015.
Accepted on: 04 June 2015.
RUSSIAN JOURNAL OF MATHEMATICAL PHYSICS