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1979ApJ...233L..43W - Astrophys. J., 233, L43-L46 (1979)
Multiple-mirror telescope observations of the twin QSOs 0957+561A, B.
WEYMANN R.J., CHAFFEE F.H., DAVIS M., CARLETON N.P., WALSH D. and CARSWELL R.F.
Journal keyword(s):
Simbad objects: 2
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