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1989A&A...215....1V - Astronomy and Astrophysics, volume 215, 1-13 (1989)
The value of the time delay delta T (A,B) for the 'double' quasar 0957+561 from optical photometric monitoring.
VANDERRIEST C., SCHNEIDER J., HERPE G., CHEVRETON M., MOLES M. and WLERICK G.
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Simbad objects: 4
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