Koch, V.

Koch, V. & de Kok, M., 1990. A health survey of the population of Ponan, Ivorycoast : children under five and the population associated with them, Wageningen, The Netherlands: Agricultural University Wageningen, Dept. of Environmental and Tropical Health. Available at: https://fr.ircwash.org/sites/default/files/824-CI90-7265.pdf.