Biblio

K. V. Ellis, “Slow sand filtration as a technique for the tertiary treatment of municipal sewages”, Water research, pp. p. 403-410: tab., 1987.

H. Bouwer, Rice, R. C., Escarcega, E. D., and Riggs, M. S., “Renovating secondary sewage by ground water recharge with inflitration basins”, vol. no. 16060DRV. US Environmental Protection Agency (EPA), Washington, DC, USA, p. 102 p. : fig., tab., 1972.