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1977A&AS...27..433Z - Astron. Astrophys., Suppl. Ser., 27, 433-434 (1977)
Four-colour photometric observations of the X-ray binary star HD 77581 (Vel X-1) I. Observations.
ZUIDERWIJK E.J., HAMMERSCHLAG-HENSBERGE G., VAN PARADIJS J., STERKEN C. and HENSBERGE H.
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Simbad objects: 2
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