TY - RPRT U1 - Forschungsbericht A1 - Schelleman, Ferd A1 - Narodoslawsky, Michael A1 - Schmidt-Bleek, Friedrich A1 - Ayres, Robert U. T1 - Operational indicators for progress towards sustainability : final report of an EC study aimed at developing a set of sustainability indicators based on LifeCycle approaches Y1 - 1996 SP - 159 S1 - 159 PB - Inst. for Applied Environmental Economics CY - The Hague PB - Inst. for Applied Environmental Economics CY - The Hague ER -