Submitted on: 05 February 2001.
Revised on: 13 February 2001.
Accepted on: 28 February 2001.
REQUIREMENTS ENGINEERING---SPRINGER
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http://reply.papertrans.cn/3/264/26366/26366-33.png
Submitted on: 13 March 2009.
Revised on: 09 April 2009.
Accepted on: 22 April 2009.
REQUIREMENTS ENGINEERING---SPRINGER
Submitted on: 02 May 2016.
Revised on: 08 June 2016.
Accepted on: 19 June 2016.
REQUIREMENTS ENGINEERING
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