aschig's Universe
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D. Sluse
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Gaia GraL: Gaia DR2 Gravitational Lens Systems. VI. Spectroscopic Confirmation and Modeling of Quadruply-Imaged Lensed Quasars
Three QSOs acting as strong gravitational lenses
First case of strong gravitational lensing by a QSO : SDSS J0013+1523 at z = 0.120
Discovery of a Probable Physical Triple Quasar
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