Hatano-Nelson model with a periodic potential F. Hébert, M. Schram, R. T. Scalettar, W. B. Chen and Z. Bai Eur. Phys. J. B, 79 4 (2011) 465-471 Published online: 16 February 2011 DOI: 10.1140/epjb/e2011-10875-9