Porous structure of membranes of an acrylonitrile copolymer. Porosity, 1H-NMR permeability A. Viallat and M.M. Margulies Eur. Phys. J. E, 2 2 (2000) 117-123 Published online: 15 June 2000 DOI: 10.1007/PL00013662