by Marshall, F. E., Netzer, H., Arnaud, K. A., Boldt, E. A., Holt, S. S., Jahoda, K. M., Kelley, R., Mushotzky, R. F., Petre, R., Serlemitsos, P. J.
Published in The Astrophysical journal (01.03.1993)

by Audley, M. D., Kelley, R. L., Boldt, E. A., Jahoda, K. M., Marshall, F. E., Petre, R., Serlemitsos, P. J., Smale, A. P., Swank, J. H., Weaver, K. A.
Published in The Astrophysical journal (1996)

by Smale, A. P., Done, C., Mushotzky, R. F., Weaver, K. A., Serlemitsos, P. J., Marshall, F. E., Petre, R., Jahoda, K. M., Boldt, E. A., Swank, J. H.
Published in The Astrophysical journal (20.06.1993)

by Miyaji, T., Mushotzky, R. F., Loewenstein, M., Serlemitsos, P. J., Marshall, F. E., Petre, R., Jahoda, K. M., Boldt, E. A., Holt, S. S., Swank, J., Szymkowiak, A. E., Kelley, R.
Published in The Astrophysical journal (10.12.1993)

by Della Ceca, R., Palumbo, G. G. C., Persic, M., Boldt, E. A., Marshall, E. E., De Zotti, G.
Published in The Astrophysical journal. Supplement series (01.03.1990)

by De Zotti, G., Persic, M., Franceschini, A., Danese, L., Palumbo, G. G. C., Boldt, E. A., Marshall, F. E.
Published in The Astrophysical journal (01.03.1990)

by Kallman, T. R., Schlegel, E. M., Serlemitsos, P. J., Petre, R., Marshall, F., Jahoda, K., Boldt, E. A., Holt, S. S., Mushotzky, R. F., Swank, J.
Published in The Astrophysical journal (10.07.1993)

by Mushotzky, R. F., Marshall, F. E., Boldt, E. A., Holt, S. S., Serlemitsos, P. J.
Published in The Astrophysical journal (01.01.1980)

by Weaver, K. A., Mushotzky, R. F., Arnaud, K. A., Serlemitsos, P. J., Marshall, F. E., Petre, R., Jahoda, K. M., Boldt, E. A., Holt, S. S., Swank, J.
Published in The Astrophysical journal (10.12.1992)

by Persic, M, Zotti, G De, Danese, L, Franceschini, A, Boldt, E A, Marshall, F E
Published in The Astrophysical journal (01.09.1989)

by Martin-Mirones, J. M., De Zotti, G., Franceschini, A., Boldt, E. A., Marshall, F. E., Danese, L., Persic, M.
Published in The Astrophysical journal (01.10.1991)

by Stottlemyer, A. R., Boldt, E. A.
Published in The Astrophysical journal (15.04.1984)

by Holt, S. S., Mushotzky, R. F., Boldt, E. A., Serlemitsos, P. J., Becker, R. H., Szymkowiak, A. E., White, N. E.
Published in The Astrophysical journal (01.10.1980)

by White, N. E., Becker, R. H., Boldt, E. A., Holt, S. S., Serlemitsos, P. J., Swank, J. H.
Published in The Astrophysical journal (01.08.1981)

by Rose, L. A., Marshall, F. E., Holt, S. S., Boldt, E. A., Rothschild, R. E., Serlemitsos, P. J., Pravdo, S. H., Kaluzienski, L. J.
Published in The Astrophysical journal (01.08.1979)

by White, N. E., Becker, R. H., Pravdo, S. H., Boldt, E. A., Holt, S. S., Serlemitsos, P. J.
Published in The Astrophysical journal (01.07.1980)

by Worrall, D. M., Marshall, F. E., Boldt, E. A., Swank, J. H.
Published in The Astrophysical journal (01.04.1982)

by Weaver, K. A., Arnaud, K. A., Boldt, E. A., Christian, D., Corcoran, M., Holt, S. S., Jahoda, K., Kelley, R., Marshall, F. E., Mushotzky, R. F.
Published in The Astrophysical journal. Supplement series (01.01.1995)

by Serlemitsos, P. J., Smith, B. W., Boldt, E. A., Holt, S. S., Swank, J. H.
Published in The Astrophysical journal (01.01.1977)

by Marshall, F. E., Boldt, E. A., Holt, S. S., Mushotzky, R. F., Rothschild, R. E., Serlemitsos, P. J., Pravdo, S. H.
Published in The Astrophysical journal. Supplement series (01.07.1979)