Characterization of Poly(styrenesulfonate) at Minimum Ionic Strength by Electric and Magnetic Birefringence Experiments C. Johner, H. Kramer, C. Martin, J. Biegel, R. Deike and R. Weber J. Phys. II France, 5 5 (1995) 721-732 DOI: 10.1051/jp2:1995160