http://reply.papertrans.cn/3/290/28936/28936-21.png
http://reply.papertrans.cn/3/290/28936/28936-22.png
http://reply.papertrans.cn/3/290/28936/28936-23.png
http://reply.papertrans.cn/3/290/28936/28936-24.png
http://reply.papertrans.cn/3/290/28936/28936-25.png
Submitted on: 25 February 2001.
Revised on: 20 March 2001.
Accepted on: 04 April 2001.
SUB-STANCE---JOHNS HOPKINS UNIV PRESS
http://reply.papertrans.cn/3/290/28936/28936-27.png
Submitted on: 02 September 2009.
Revised on: 05 October 2009.
Accepted on: 15 October 2009.
SUB-STANCE---JOHNS HOPKINS UNIV PRESS
http://reply.papertrans.cn/3/290/28936/28936-29.png
Submitted on: 22 October 2002.
Revised on: 16 November 2002.
Accepted on: 07 December 2002.
SUB-STANCE