AdS-QCD quark–antiquark potential, meson spectrum and tetraquarks M. V. Carlucci, F. Giannuzzi, G. Nardulli, M. Pellicoro and S. Stramaglia Eur. Phys. J. C, 57 3 (2008) 569-578 Published online: 27 August 2008 DOI: 10.1140/epjc/s10052-008-0687-2