Charge inversion, condensation and decondensation of DNA and polystyrene sulfonate by polyethylenimine V. Mengarelli, L. Auvray, D. Pastré and M. Zeghal Eur. Phys. J. E, 34 11 (2011) 127 Published online: 25 November 2011 DOI: 10.1140/epje/i2011-11127-3