TY - JOUR A1 - Köhler, Anna A1 - Beljonne, David T1 - The singlet-triplet exchange energy in conjugated polymers Y1 - 2004 UR - https://publishup.uni-potsdam.de/frontdoor/index/index/docId/14862 SN - 1616-3028 SN - 1616-301X ER -