Huppes, G. and Ishikawa, M. (2010) “Letter to the Editorial Office: Eco-efficiency for Sustainability: the Challenge Investigated at the 3rd Eco-Efficiency Conference, 9-11 June 2010”, Problemy Ekorozwoju, 5(2), pp. 155–156. Available at: https://ph.pollub.pl/index.php/preko/article/view/4758 (Accessed: 22 December 2024).