S. Veenstra, Alaerts, G. J., Bentvelsen, M., and van Duijl, L. A.,
“Feasibility of anaerobic sewage treatment in sanitation strategies in developing countries”, vol. no. 20. IHE (International Institute for Infrastructural, Hydraulic and Environmental Engineering), Delft, The Netherlands, p. ix, 130 p.: fig., photogr., tab., 1990.
