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“How farmers in Switzerland perceive fertilizers from recycled anthropogenic nutrients (urine)”,
Water science and technology, pp. p. 47-56 : 2 fig., 5 tab., 2003.
C. Pahl-Wostl, Schonborn, A., Willi, N., Muncke, J., and Larsen, T. A.,
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Water science and technology, pp. p. 57-65 : 4 fig., 2003.