Biblio

M. Wegelin, Schertenleib, R., y Boller, M., «The decade of roughing filters : development of a rural water-treatment process for developing countries», Aqua : journal of water supply research and technology, pp. p. 304-316: 17 fig., 2 tab., 1991.

A. Boesch y Schertenleib, R., «Emptying on-site excreta disposal systems : field tests with mechanized equipment in Gaborone (Botswana)», vol. no. 03/85. International Reference Centre for Waste Disposal, Duebendorf, Switzerland, p. 110 p. in various pagings: ills., 1985.