Conformational dynamics of phenylene rings in poly(p-phenylene vinylene) as revealed by 'ANTPOT.13 C' magic-angle-spinning exchange nuclear magnetic resonance experiments - Azevêdo, Eduardo Ribeiro de; Franco, R. W. A.; Marletta, A.; Faria, Roberto Mendonça; Bonagamba, Tito José (Journal of Chemical Physics, 2003)