Mass-asymmetry effects in coupled electron-hole quantum wire system R. K. Moudgil, Vinayak Garg and P. K. Ahluwalia Eur. Phys. J. B, 74 4 (2010) 517-525 Published online: 24 March 2010 DOI: 10.1140/epjb/e2010-00103-9