X- and gamma-ray astronomy / ed. by H. Bradt and R. GiacconiX-ray astronomy / ed. by Riccardo Giacconi and Herbert GurskyFisica ed astrofisica delle stelle di neutroni e dei buchi neri = Physics and astrophysics of neutron stars and black holes : Varenna sul Lago di Como, Villa Monastero, 14-26 luglio 1975 / a cura di R. Giacconi e R. RuffiniX-ray astronomy : proceedings of the NATO Advanced Study Institute held at Erice, Sicily, July 1-14, 1979 / ed. by Riccardo Giacconi and Giancarlo SettiX-ray astronomy with the Einstein satellite : proceedings of the High Energy Astrophysics Division of the American Astronomical Society meeting on X-ray astronomy held at the Harvard/Smithsonian Center for Astrophysics, Cambridge, Massachusetts, U.S.A., January 28-30, 1980 / ed. by Riccardo Giacconi