TY  - GEN
AU  - Weizsacker, Ernst Von
TI  - Factor four doubling wealth, halving resource use
SN  - 9781853834066
U1  - 628 
PY  - 1998///
CY  - London
PB  - Earthscan Publications
KW  - Factor four
N1  - Includes references & indexes
ER  -