Electron swarm coefficients in 1,1,1,2 tetrafluoroethane (R134a) and its mixtures with Ar J. de Urquijo, A. M. Juárez, E. Basurto and J. L. Hernández-Ávila Eur. Phys. J. D, 51 2 (2009) 241-246 Published online: 16 January 2009 DOI: 10.1140/epjd/e2008-00288-6