Ground-state energy of a classical artificial molecule L. Cândido, T. L. Fonseca, J. N. Teixeira Rabelo and G.-Q. Hai Eur. Phys. J. B, 64 1 (2008) 81-86 Published online: 16 July 2008 DOI: 10.1140/epjb/e2008-00284-8