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- Bibinfo (this paper at ADS)
- Patterson, J., 1991, PASP, 103, 1149-1157.
- Observational: Optical and X-ray timing.
- GK Per.
- U band photometry detects the 351.34 spin period; blue
band photometry detects QPO on the low-frequency shoulder.
Evidence for long-term spin-up found, though a unique long-term
ephemeris cannot be established securely.
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