1. Allenby , B. R. and D. J. RichardsThe Greening of Industrial Ecosystems, National Academic Press , Washington , DC , pp. pI–5 p, ( 1994 ).
2. ASM Handbook, Properties and Selection - Nonferrous Alloys and Special-Purpose Materials, ASM International , Materials Park , OH , Vol. 2 , pp. 491 – 496 , ( 1986 ) .