Hard X-ray monitoring of Centaurus A by SIGMA during 1990-94: Definition of a low luminosity state. Bond, I.A; Ballet, J; Denis, M; Vargas, M; Jourdain, E; Roques, J.P; Bouchet, L; Niel, M; Chernyakova, M; Churazov, E; Gilfanov, M; Sunyaev, R; Finoguenov, A; Dyachkov, A; Khavenson, N; Novikov, B. Astronomy and Astrophysics 1996

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