Sintering of kaolin in presence of ferric compound: Study by ultrasonic echography N.S. Soro, P. Blanchart, J.P. Bonnet, J.M. Gaillard, M. Huger et A. TouréJ. Phys. IV France, 123 (2005) 131-135DOI: https://doi.org/10.1051/jp4:2005123022