Viiala, J.

Viiala, J., 1987. Handpump technology in developing countries with special reference to experiences in South-East Tanzania, (Publication Series B / Tampere University of Technology no. 27) Tampere, Finland: Tampere University of Technology, Institute of Water and Environmental Engineeri. Available at: https://www.ircwash.org/sites/default/files/232.2-3428.pdf.