200 citations · 392 across the 4 of their papers we have counts for
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astro-ph2008★ 15 cited
The Luminosity and Energy Dependence of Pulse Phase Lags in the Accretion-powered Millisecond Pulsar SAX J1808.4-3658
Jacob M. Hartman, Anna L. Watts, Deepto Chakrabarty
Soft phase lags, in which X-ray pulses in lower energy bands arrive later than pulses in higher energy bands, have been observed in nearly all accretion-powered millisecond pulsars…
astro-ph2007★ 200 cited
The long-term evolution of the spin, pulse shape, and orbit of the accretion-powered millisecond pulsar SAX J1808.4-3658
Jacob M. Hartman, Alessandro Patruno, Deepto Chakrabarty +6
We present a 7 yr timing study of the 2.5 ms X-ray pulsar SAX J1808.4-3658, an X-ray transient with a recurrence time of ~2 yr, using data from the Rossi X-ray Timing Explorer cove…