Therkelsen, H.

Hansen, J.A. & Therkelsen, H., 1977. Alternative sanitary waste removal systems for low-income urban areas in developing countries Second non-revised printing, 1978ᵉ éd., Lyngby, Denmark: Polyteknisk Forlag. Available at: http://fr.ircwash.org/sites/default/files/301-78AL.pdf.