2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/39842Recent developments for an effective theory for non-relativistic perturbative quark-antiquark systems are reviewed and some applications are discussed.15 pages, latex (sprocl.sty), 2 postscript figures. Invited talk presented at the 5th Workshop on QCD (QCD 2000), Villefranche-sur-Mer, France, 3-7 Jan 2000High Energy Physics - Phenomenologytext