2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/147059For a complex surface of general type with a relatively minimal genus 2 fibration, the bounds of the orders of the automorphism group of the fibration, of its abelian subgroups and of its cyclic subgroups are determined as linear functions of $c^2_1$. Most of them are the best.30 pages, LaTeX2.09Algebraic Geometrytext