XUV Photometer System (XPS): Improved Solar Irradiance Algorithm Using CHIANTI Spectral Models

XUV Photometer System (XPS): Overview and Calibrations

XUV Photometer System (XPS): Solar Variations during the SORCE Mission

XUV polarimeter for undulator radiation measurements

XUV Spectra from an ECR ion source plasma and from charge transfer collisions

XUV spectroscopy of metal atoms

XUV wide field camera for ROSAT.

XV SPECIAL COURSES AT THE NATIONAL OBSERVATORY OF RIO DE JANEIRO

XVIII. The Meteorite from Glorieta Mountain, Santa Fe Co., New Mexico.

XVIIth COSPAR meeting preceded by symposium on solar-terrestrial physics, symposium on satellite dynamics, COSPAR workshop and seminar Brazil, June-July 1974

XVIth Meeting of COSPAR and Specialized Symposia

XX and Ising limits in integral formulae for finite temperature correlation functions of the XXZ chain

XX Cep BVRI light curves (Lee+, 2007)

XX Cephei: New Times of Minimum and a Study of the Period

XX model on the circle

XX Ophiuchi

XX Ophiuchi in Deep Minimum after 37 Years

XXIInd National Australian Convention of Amateur Astronomers

XXIVth International Symposium on Lattice Field Theory

XXL - An overview of the ultimate XMM extragalactic survey