TY - JOUR A1 - Nunner, Tamara S. A1 - Brune, Philipp A1 - Kopp, Thilo A1 - Windt, Marco A1 - GrĂ¼ninger, Markus T1 - Cyclic spin exchange in cuprate spin ladders T2 - Physical Review B Y1 - 2002 UR - https://opus.bibliothek.uni-augsburg.de/opus4/frontdoor/index/index/docId/59631 SN - 0163-1829 SN - 1095-3795 VL - 66 IS - 18 SP - 180404(R) PB - American Physical Society (APS) ER -