Scaling out the density dependence of the α relaxation in glass-forming polymers C. Alba-Simionesco, A. Cailliaux, A. Alegría and G. Tarjus Europhys. Lett., 68 1 (2004) 58-64 Published online: 01 September 2004 DOI: 10.1209/epl/i2004-10214-6