%0 conference lecture %@ %A Kamusewitz, H., Fritzsche, W., Bielza, J. M., Keller, M., Paul, D. %D 1997 %J 9. International Conference on Scanning Tunneling Microscopy %P 282 %T Characterization of Polymeric Membranes by Means of Pneumatic Scanning Force Microscopy %U %X