Quantum breathers in a finite Heisenberg spin chain with antisymmetric interactions Z. I. Djoufack, A. Kenfack-Jiotsa and J. P. Nguenang Eur. Phys. J. B, 85 3 (2012) 96 Published online: 14 March 2012 DOI: 10.1140/epjb/e2012-20707-1