2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/54828It is shown that time-harmonic motions of spherical and toroidal surfaces can be deformed non-locally without loosing the existence of infinitely many constants of the motion.8 pages, LaTex, Talk presented at the Centro Stefano FransciniHigh Energy Physics - Theorytext