2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/55190This lecture is dedicated to the memory of Vladimir Gribov. We discuss the procedure of complete gauge fixing to avoid Gribov copies, as well as results for the low-lying glueball spectrum in intermediate volumes for the torus and for the sphere that became available recently.18p with 8 figs. Lecture delivered at the NATO ASI ``Confinement, Duality and Non-perturbative Aspects of QCD'', Newton Institute, Cambridge, UK, 23 June - 4 July, 1997High Energy Physics - Theorytext