X Persei - Optical 13.9-minute periodicity

X Persei and the X-Ray Source 3U 0352+30

X Persei and X-ray source 3U0352+30

X Radiation From Accreting Non-Magnetic Degenerate Dwarfs: The Regime at Large Electron Scattering Optical Depths.

X ray AGN variability with hour to month timescales

X ray archeology in the Coma cluster

X ray burster spectra in the state of the persistent flux level. Two temperature models of the neutron star atmosphere

X ray cluster counts: What ROSAT should see

X ray constraints on the beaming hypothesis for BL Lacertae objects

X Ray Emission from Active Galactic Nuclei and the Cosmic X Ray Background

X ray emission from dynamical shock models in hot-star winds

X ray emission from relativistic jets in AGNs and statistical implications

X ray emission from Wolf-Rayet stars with recurrent dust formation

X ray luminosity and spectral variability of a complete sample of AGN's

X ray morphology and the mass of clusters of galaxies

X ray morphology of clusters of galaxies

X ray nova GS 2000+25 = Nova VUL 1988: X ray and optical light curves, spectra, and model

X ray observations of gamma ray burst sources

X ray observations of GS2023+338 by the KVANT module

X ray observations of SS433 and its jets