Helness, H., S. Damman, W.P. de Clercq, and N.M. Elema. “A Framework for Integrated Sustainability Assessment of Water Cycle Services”. European Journal of Sustainable Development 6, no. 4 (October 1, 2017): 1. Accessed April 28, 2024. http://ojs.ecsdev.org/index.php/ejsd/article/view/542.