A novel analysis for the NMR magic sandwich echo in polymers: application to the α-relaxation in polybutadieneMarco Pieruccini, Simone Sturniolo, Maurizio Corti and Attilio RigamontiEur. Phys. J. B, 88 11 (2015) 283DOI: https://doi.org/10.1140/epjb/e2015-60417-6