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Dyfyniad Arddull ChicagoSchawinski, K., et al. The Sudden Death of the Nearest Quasar. 2010.
Dyfyniad MLASchawinski, K., et al. The Sudden Death of the Nearest Quasar. 2010.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.