Negative ion clusters in oxygen: collision cross sections and transport coefficients J. de Urquijo, A. Bekstein, O. Ducasse, G. Ruíz-Vargas, M. Yousfi and M. Benhenni Eur. Phys. J. D, 55 3 (2009) 637-643 Published online: 19 September 2009 DOI: 10.1140/epjd/e2009-00248-8