Dielectric relaxation studies of poly(propylene glycol) confined in vermiculite clay G.A. Schwartz, R. Bergman, J. Mattsson and J. Swenson Eur. Phys. J. E, 12 (2003) 113-116 Published online: 05 November 2003 DOI: 10.1140/epjed/e2003-01-026-0