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O. J. Hanssen
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Experiences of environmental performance evaluation in the cement industry. Data quality of environmental performance indicators as a limiting factor for Benchmarking and Rating
B. von Bahr, O. J. Hanssen, M. Vold, 2003 .
Sustainable product systems—experiences based on case projects in sustainable product development
O. J. Hanssen, O. Hanssen, 1999 .