Naranjo, A., Castellano, D., Kraaijvanger, H., Meulman, B., Mels, A., y Zeeman, G., «The MobiSan approach : informal settlements of Cape Town, South Africa», Water science and technology, pp. p. 3078–3090 : 13 fig., 2 tab., 2010.

Martijn, E.J., Kampf, R., Claassen, T., y Mels, A., «Use of the waterharmonica for conversion of treated waste water into a natural resource in the developing world [draft paper for conference Ecological Engineering for Integrated Water Management (Oct. 30 - Nov. 2, 2003) Harvard Graduate School of Design, ». p. 13 p. : 4 fig., 2003.