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1993A&A...278..444L - Astronomy and Astrophysics, volume 278, 444-448 (1993)
Photon spectrum and period evolution of GX 1+4 as observed at hard X-ray energies by SIGMA.
LAURENT P., SALOTTI L., PAUL J., LEBRUN F., DENIS M., BARRET D., JOURDAIN E., ROQUES J.P., CHURAZOV E., GILFANOV M., SUNYAEV R., DYACHKOV A., KHAVENSON N., NOVIKOV B., CHULKOV I. and KUZNETZOV A.
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Simbad objects: 1
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