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Real space renormalization group approach to the two-dimensional antiferromagnetic Heisenberg model (I) – The singlet triplet gap

A. Fledderjohann, A. Klümper and K.-H. Mütter

Eur. Phys. J. B, 72 4 (2009) 541-558

DOI: https://doi.org/10.1140/epjb/e2009-00381-2

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