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H. V. Brandt et al., The X-Ray Timing Explorer - 5. The Proportional Counter Array (PCA), in Y. Kondo (a cura di), Observatories in Earth Orbit and Beyond: Proceedings of the 123RD Colloquium of the International Astronomical Union, Held in Greenbelt, Maryland, U.S.A., April 24—27,1990, Springer Science & Business Media, 6 dicembre 2012, p. 94. URL consultato il 7 dicembre 2017.