Submitted on: 23 June 1998.
Revised on: 04 July 1998.
Accepted on: 17 July 1998.
North American Journal of Economics and Finance
http://reply.papertrans.cn/3/233/23247/23247-22.png
Submitted on: 09 January 2011.
Revised on: 11 February 2011.
Accepted on: 10 March 2011.
North American Journal of Economics and Finance
http://reply.papertrans.cn/3/233/23247/23247-24.png
Submitted on: 26 May 2023.
Revised on: 22 June 2023.
Accepted on: 03 July 2023.
North American Journal of Economics and Finance
http://reply.papertrans.cn/3/233/23247/23247-26.png
Submitted on: 01 November 2012.
Revised on: 09 November 2012.
Accepted on: 21 November 2012.
North American Journal of Economics and Finance
Submitted on: 15 March 2001.
Revised on: 16 April 2001.
Accepted on: 10 May 2001.
North American Journal of Economics and Finance
Submitted on: 10 April 2007.
Revised on: 27 April 2007.
Accepted on: 19 May 2007.
North American Journal of Economics and Finance
http://reply.papertrans.cn/3/233/23247/23247-30.png