Aguilar, J.-P., J. Michaux, T. Pélissié, and B. Sigé. “Early Late Pliocene Paleokarstic Fillings Predating the Major Plio-Pleistocene Erosion of the Quercy Table, SW-France”. Acta Carsologica, vol. 36, no. 3, Dec. 2007, doi:10.3986/ac.v36i3.180.