Dielectric spectroscopy of melt-extruded polypropylene and as-grown carbon nanofiber composites A. J. Paleo, Z. Samir, N. Aribou, Y. Nioua, M. S. Martins, M. F. Cerqueira, J. Agostinho Moreira and M. E. Achour Eur. Phys. J. E, 44 5 (2021) 73 Published online: 28 May 2021 DOI: 10.1140/epje/s10189-021-00079-w