\[10\]Steen,B.A Systematic Approach to Environmental Priority Strategies in Product Development(EPS):Version 2000General System Characteristics\[R\].Centre for Environmental Assessment of Products and Material Systems,1999.
[10]
\[11\]Goedkoop,M.,R.Spriensma.The Ecoindicator99:A Damage Oriented Method for Life Cycle Impact Assessment\[R\].The Netherlands:PRé Consultants B.V.,2001.