Adsorption and localization of random copolymers subject to a force: The Morita approximation G. Iliev, E. Orlandini and S. G. Whittington Eur. Phys. J. B, 40 1 (2004) 63-71 Published online: 03 August 2004 DOI: 10.1140/epjb/e2004-00239-1