“Handpump design put to the test”,
World water, p. p. 22: photogr., 1989.
T. E. Manning, Cefis, G., and Mencarelli, E.,
“Pulsa solar water oscillation pumps”, in
Water, engineering and development in Africa : proceedings of the 15th WEDC Conference, Kano, Nigeria, 3-7 April 1989, 1989, pp. P. 88-91: fig.
