Characterization of ultrafiltration membranes using S.T.M. Adil Chahboun, Roland Coratger, François Ajustron, Jacques Beauvillain, Pierre Aimar and Victor Sanchez Microsc. Microanal. Microstruct., 2 4 (1991) 493-500 DOI: 10.1051/mmm:0199100204049300