xPert: Computer algebra for metric perturbation theory

XPOL - the correlation polarimeter at the IRAM 30m telescope

XPOL: a photoelectric polarimeter onboard XEUS

XRASE: the X-ray spectroscopic explorer

Xray observations of high redshift radio galaxies

XRF 011030: the case of a late X-ray flare observed by BeppoSAX

XRF 050406 late-time flattening: an inverse Compton component?

XRF 100316D / SN 2010bh and the Nature of Gamma Ray Burst Supernovae

XRF 100316D/SN 2010bh: clue to the diverse origin of nearby supernova-associated GRBs

XROM and RCOM: Two New OGLE-III Real Time Data Analysis Systems

XRT Light curves: Morphology, Flares and Energy

XSL: The X-Shooter Spectral Library

XSPEC: An X-ray spectral fitting package

XSPEC: Progress and Plans

Xspect, estimation of the angular power spectrum by computing cross-power spectra with analytical error bars

XSS J00564+4548 and IGR J00234+6141 -- new cataclysmic variables from RXTE and INTEGRAL all sky surveys

XSTAR: A program for calculating conditions and spectra of photoionized gases

XTE and SAX observations of the Be/neutron star system RX J0146.9+6121

XTE J0111.2-7317 : a nebula-embedded X-ray binary in the SMC

XTE J1118+480: A Metal-Rich Black Hole Binary in the Galactic Halo