Quinn, J., Akerlof, C.W., Biller, S.D., Buckley, J.H., Carter-Lewis, D.A., Cawley, Michael F., Catanese, M., Connaughton, V., Fegan, D.J., Finley, J.P., Gaidos, J.A., Hillas, A.M., Lamb, R.C., Krennrich, F., Lessard, R.W., McEnery, J.E., Meyer, D.I., Mohanty, G., Rodgers, A.J., Rose, H.J., Schubnell, M.S., Sembroski, G.H., Weekes, T.C., Wilson, C.W. and Zweerink, J. (1996) Detection of Gamma Rays with E > 300 GeV from Markarian 501. Astrophysical Journal, 456 (L83). ISSN 0004-637X
Punch, Michael, Akerlof, C.W., Cawley, Michael F., Chantell, M., Fegan, D.J., Fennell, S., Gaidos, J.A., Hagan, J., Hillas, A.M., Jiang, Y., Kerrick, A.D., Lamb, R.C., Lawrence, M.A., Lewis, D.A., Meyer, D.I., Mohanty, G., O'Flaherty, K.S., Reynolds, P.T., Rovero, A.C., Schubnell, M.S., Sembroski, G., Weekes, T.C., 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