X-ray and optical observations of BL Lac objects: 3C 66A (B0219+428) and ON 325 (B1215+303)

X-ray and optical observations of HD 155638 - A remarkably active cool star

X-ray and Optical Observations of Neutron Stars and Pulsar Wind Nebulae

X-ray and optical observations of the AM HER star H0139-68

X-ray and optical observations of the closest isolated radio pulsar

X-Ray and Optical Observations of the New X-ray Transient XTE J2123-058

X-ray and optical observations of the old nova V 603 AQL

X-ray and optical observations of the ultrashort period dwarf nova SW Ursae Majoris - A likely new DQ Herculis star

X-ray and optical observations of the unique binary system HD49798/RXJ0648.0-4418

X-ray and optical observations of three clusters of galaxies: Abell 901, Abell 1437, and Abell 3570

X-Ray and Optical Observations of XTE J0052-723 a Transient Be/X-Ray Pulsar in the Small Magellanic Cloud

X-ray and optical periodicities in X-ray binaries. I.A0535+26

X-ray and optical properties of Broad Absorption Line Quasars in the Canada-France-Hawaii Telescope Legacy Survey

X-Ray and Optical Properties of Groups of Galaxies

X-ray and optical properties of new Gamma Cas-like objects discovered in X-ray surveys

X-ray and optical properties of X-ray sources in the 13hr XMM-Newton/Chandra deep survey

X-ray and Optical Study of Low Core Density Globular Clusters NGC6144 and E3

X-ray and optical study of the giant radio quasar 4C +74.26

X-ray and optical study of the new SMC X-ray binary pulsar system SXP7.92 and its probable optical counterpart, AzV285

X-Ray and Optical Variability in NGC 4051 and the Nature of Narrow-Line Seyfert 1 Galaxies