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Punch, Michael and Akerlof, C.W. and Cawley, Michael F. and Chantell, M. and Fegan, D.J. and Fennell, S. and Gaidos, J.A. and Hagan, J. and Hillas, A.M. and Jiang, Y. and Kerrick, A.D. and Lamb, R.C. and Lawrence, M.A. and Lewis, D.A. and Meyer, D.I. and Mohanty, G. and O'Flaherty, K.S. and Reynolds, P.T. and Rovero, A.C. and Schubnell, M.S. and Sembroski, G. and Weekes, T.C. and Whitaker, T. and Wilson, C. (1992) Detection of TeV photons from the Active Galaxy Markarian 421. Nature, 358 (6386). pp. 477-478. ISSN 1476-4687