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Lorenz, T.; Heyer, O.; Garst, M.; Anfuso, F.; Rosch, A.; Rüegg, Ch.; Krämer, Karl (2008). Diverging thermal expansion of the spin-ladder system (C5H12N)2CuBr4. Physical review letters, 100(6), p. 67208. Ridge, N.Y.: American Physical Society 10.1103/PhysRevLett.100.067208