Machin Sanchez, R.

R. Sanchez, M., Suswillo, R.R. & Muller, M., 1989. Evaluation of a sanitation programme using eggs of Ascaris lumbricoides in household yard soils as indicators. , ppp. 10-16: fig., tab. Available at: https://pt.ircwash.org/sites/default/files/303-89EV-6174.PDF.