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Dyfyniad Arddull ChicagoWold, Margrethe. The Environment of Active Galactic Nuclei: Excess Counts and the Nature of Their Host Clusters. 2001.
Dyfyniad MLAWold, Margrethe. The Environment of Active Galactic Nuclei: Excess Counts and the Nature of Their Host Clusters. 2001.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.