Relatively-long time decay of Loschmidt echo of a Bose-Einstein condensate in a double-well potential Q. Zheng, W. G. Wang, X. P. Zhang and Z. Ren Eur. Phys. J. D, 58 3 (2010) 275-279 Published online: 06 April 2010 DOI: 10.1140/epjd/e2010-00090-y