The Gas Imaging Spectrometer on Board ASCATakaya Ohashi, Toshiaki Takeshima, Riichirou Shoumura et al.|Publications of the Astronomical Society of Japan|1996Cited by 250
New observations of the cyclotron absorption feature in Hercules X–1T. Mihara, P. E. Boynton, J. E. Deeter et al.|Nature|1990Cited by 151
Discovery of a prominent cyclotron absorption feature from the transient X-ray pulsar X0331 + 53Kazuo Makishima, Martin Turner, T. Murakami et al.|The Astrophysical Journal|1990Cited by 100