Quantum breathers in a finite Heisenberg spin chain with antisymmetric interactionsZ. I. Djoufack, A. Kenfack-Jiotsa and J. P. NguenangEur. Phys. J. B, 85 3 (2012) 96DOI: https://doi.org/10.1140/epjb/e2012-20707-1