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2“... such as active galaxies, and gamma-ray bursts. Comment: 8 pages, to be published with the proceedings of the XXth...”
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3by Halzen, F.“... the observations as well as speculations about the sources. Among these gamma ray bursts and active galaxies...”
Published 2003
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4by Sarkar, Subir“... microwave background. However they do not point back towards possible nearby sources, e.g. the active galaxy...”
Published 2002
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5by Mueller, Cornelia, Kadler, M., Ojha, R., Boeck, M., Fromm, C. M., Ros, E., Rothschild, R. E., Wilms, J.“...At a distance of about 3.8 Mpc, the radio galaxy Centaurus A is the closest active galaxy...”
Published 2010
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