G. P. Alabaster, Coffey, M., and Wegelin-Schuringa, M. H. A.,
“Evaluation of novel pit-latrine exhauster with improved access for low-income settlements”. UN-Habitat, United Nations Centre for Human Settlements, Nairobi, Kenya, p. 2 p. : 1 fig., 1 tab., 1996.
M. H. A. Wegelin-Schuringa, Gitonga, J., and Kodo, T.,
“Innovative emptying - improving slum sanitation in Kibera”,
Waterlines, an international journal of water, sanitation and waste, p. p. 26 : 2 photogr., 1996.