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1983ChA&A...7...86C - Chinese Astron., 7, 86-91 (1983)
Photoelectric and spectral observations of Vela X-1 during the time of sudden changes in its X-ray pulse period.
CHEN J.-S., TANG X.-Y., BIAN Y.-L. and ZOU Z.-L.
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Simbad objects: 1
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