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1980ApJ...241..507Y - Astrophys. J., 241, 507-520 (1980)
The double quasar Q0957+561 A, B: a gravitational lens image formed by a galaxy at z=0.39.
YOUNG P., GUNN J.E., KRISTIAN J., OKE J.B. and WESTPHAL J.A.
Journal keyword(s):
Nomenclature: Fig. 1b: YGKOW GN (Nos G1-G5)
Simbad objects: 7
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