Groen, J.

Groen, J., Schuchmann, J.B. & Geirnaert, W., 1988. The occurrence of high nitrate concentration in groundwater in villages in Northwestern Burkina Faso. , p.p. 999-1009: fig., tab. Available at: https://fr.ircwash.org/sites/default/files/241.3-5818.pdf.