Entanglement and the Born-Oppenheimer approximation in an exactly solvable quantum many-body system Peter A. Bouvrie, Ana P. Majtey, Malte C. Tichy, Jesus S. Dehesa and Angel R. Plastino Eur. Phys. J. D, 68 11 (2014) 346 Published online: 17 November 2014 DOI: 10.1140/epjd/e2014-50349-2