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Luis Gonzalez-Mestres (1997-05-26). "Absence of Greisen-Zatsepin-Kuzmin Cutoff and Stability of Unstable Particles at Very High Energy, as a Consequence of Lorentz Symmetry Violation". Proceedings of the 25th International Cosmic Ray Conference (Held 30 July - 6 August). 6: 113. arXiv:physics/9705031. Bibcode:1997ICRC....6..113G.