2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/146866We give explicit examples of Gorenstein surface singularities with integral homology sphere link, which are not complete intersections. Their existence was shown by Luengo-Velasco, Melle-Hernandez and Nemethi, thereby providing counterexamples to the Universal abelian covering conjecture of Neumann and Wahl.Some examples and explanations added; updated version. 23 pagesAlgebraic Geometry32S25text