2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/87440We discuss possible violations of Poincare's relativity principle at energy scales close to Planck scale and point out the potentialities of high-energy cosmic-ray physics to uncover these new phenomena.Talk given at the Workshop on "Topics in Astroparticle and Underground Physics", Gran Sasso September 1997. 3 pages, LaTex, uses espcrc2.styGeneral Physicstext