Submitted on: 29 January 2013.
Revised on: 23 February 2013.
Accepted on: 11 March 2013.
St Petersburg Mathematical Journal
Submitted on: 02 July 2015.
Revised on: 06 August 2015.
Accepted on: 19 August 2015.
St Petersburg Mathematical Journal
http://reply.papertrans.cn/3/286/28593/28593-33.png
Submitted on: 06 August 2013.
Revised on: 19 September 2013.
Accepted on: 12 October 2013.
St Petersburg Mathematical Journal
Submitted on: 05 July 2022.
Revised on: 19 July 2022.
Accepted on: 30 July 2022.
St Petersburg Mathematical Journal
Submitted on: 02 March 2006.
Revised on: 12 April 2006.
Accepted on: 30 April 2006.
St Petersburg Mathematical Journal