J. Lienert, Haller, M., Berner, A., Stauffacher, M., y Larsen, T. A.,
«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., y Larsen, T. A.,
«Investigating consumer attitudes towards the new technology of urine separation»,
Water science and technology, pp. p. 57-65 : 4 fig., 2003.