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Patterson 1991

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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