Baumann, W.

Baumann, W. & Karpe, H.J., 1980. Wastewater treatment and excreta disposal in developing countries : report on a research project, Eschborn, Germany: German Appropriate Technology Exchange (GATE) /Deutsche Gesellschaft für Technische Zusammenarbeit (GTZ). Available at: http://fr.ircwash.org/sites/default/files/301-80WA-522.pdf.