X & Y

X 1908+075: An X-ray Binary with a 4.4 day Period

X = K under review

X and gamma ray flaring of 3C279 and the baryonic component of nonthermal particle distributions in radiojets

X and Radio Emission from Local Solar Sources.

X and Radio Emission from Local Solar Sources.

X and UV radiation from accreting magnetic degenerate dwarfs

X and UV Radiation from Accreting Magnetic Degenerate Dwarfs.

X and Y Functions for Planetary Atmospheres with Lambert Law Reflecting Surfaces

X and Y Spermatozoa

X and Y waves in the spatiotemporal Kerr dynamics of a self-guided light beam

X band model of Venus atmosphere permittivity

X Crucis

X Cyg: observations from 1886 until today

X Cygni

X Cygni - Duplicity, period stability, and atmospheric velocity structure

X Cygni: duplicity, period stability, and atmospheric structure.

X Factor And Gas-to-dust Ratio In The Lmc

X Her and TX Psc: Two cases of ISM interaction with stellar winds observed by Herschel

X Herculis