TY - BOOK U1 - Buch A1 - Weizsäcker, Ernst U. von A1 - Lovins, Amory B. A1 - Lovins, L. Hunter T1 - Factor four : doubling wealth - halving resource use Y1 - 2001 SN - 7-80100-396-9 SB - 7-80100-396-9 SP - 415 S1 - 415 PB - Zhong Hua Gong Shang Lian He Chu Ban She CY - Beijing ER -