Description of non-Markovian effect in open quantum system with the discretized environment method Denis Lacroix, Vazgen Sargsyan, Gurgen Adamian and Nikolai Antonenko Eur. Phys. J. B, 88 4 (2015) 89 Published online: 06 April 2015 DOI: 10.1140/epjb/e2015-60052-3