Applying the pseudovariational method of M. A. Biot to an axisymmetrical flow in a body characterized by 'dubbel porosity' gives, in the case of a pumping with constant level, results that are in good accordance with the discharge curve observed in the geothermal well drilled in the region of Möns.
Godfriaux Ivan, Rorive Alain. Sur la piézométrie de la nappe des «Craies» de la Vallée de la Haine (Mons-Belgique). In: Bulletin de la Classe des sciences, tome 64, 1978. pp. 473-477.