X-ray observations of Cas A

X-ray observations of cataclysmic variable stars with the XMM-Newton space observatory

X-Ray Observations of Edge-On Disk Galaxies with Radio Halos

X-ray observations of SN1987A with Ginga

X-ray observations of the Cygnus Loop using a crystal spectrometer

X-Ray Observations of the First Counterpart to a Fast X-Ray Transient, XRF010930

X-Ray Observations of the First Counterpart to a Fast X-Ray Transient, XRF010930

X-ray observations of the first known eclipsing ultra-compact binary system

X-Ray Observations of the Transient Source CEN XR-4

X-ray Observations of the Vela Supernova Remnant Ejecta Fragments

X-ray optical properties of a Wolter Type I telescope for rocket application

X-ray performance of the engineering prototype Stellar X-Ray Polarimeter

X-ray phase plate for energy-dispersive and mononchromatic experiments

X-ray photoelectron and Auger electron spectroscopic studies of pyrrhotite and mechanism of air oxidation

X-ray photoelectron and Auger electron spectroscopy of air-oxidized pyrrhotite: Distribution of oxidized species with depth

X-ray photoelectron spectroscopic study of ferromanganese nodules: Chemical speciation for selected transition metals

X-ray photoelectron spectroscopic study of water adsorption on iron sulphide minerals

X-ray photoelectronic spectroscopic study of regolith collected by the Luna-20 lunar station

X-ray photoelectronic spectroscopy on telluride crystal grown in tube with carbon film

X-Ray Photoemission Studies of the Surface Composition of Lunar Impact Glass Samples Including 12054