Biblio

H. Hofman, “Value analysis of materials used in rural water supply systems : progress report”. IWACO, Bandung, Indonesia, p. ii, 32 p.: fig., tab., 1982.

R. W. Parkinson and Giles, R. G., “A survey of renovation techniques for water mains”, vol. 38. Water Research Centre, Medmenham, UK, p. 31 p., 1977.