Submitted on: 17 May 1998.
Revised on: 13 June 1998.
Accepted on: 28 June 1998.
MARKETING LETTERS---SPRINGER
http://reply.papertrans.cn/3/214/21304/21304-22.png
Submitted on: 25 December 2002.
Revised on: 05 January 2003.
Accepted on: 26 January 2003.
MARKETING LETTERS
http://reply.papertrans.cn/3/214/21304/21304-24.png
http://reply.papertrans.cn/3/214/21304/21304-25.png
Submitted on: 22 January 2016.
Revised on: 16 February 2016.
Accepted on: 23 February 2016.
MARKETING LETTERS
http://reply.papertrans.cn/3/214/21304/21304-27.png
http://reply.papertrans.cn/3/214/21304/21304-28.png
Submitted on: 20 January 2014.
Revised on: 09 February 2014.
Accepted on: 25 February 2014.
MARKETING LETTERS---SPRINGER
Submitted on: 11 November 2007.
Revised on: 09 December 2007.
Accepted on: 18 December 2007.
MARKETING LETTERS---SPRINGER