Spectroscopic Follow-up of X-ray Sources in the ChaMPlane Survey: Identification of a New Cataclysmic Variable

Spectroscopic Signatures of the Superorbital Period in the Neutron Star Binary LMC X-4

Spectroscopy of Broad Line Blazars from 1LAC

Spectroscopy of the bright optical counterparts of X-ray sources in the direction of M 31. II

Spectroscopy of the stellar wind in the Cygnus X-1 system

Spectrum and composition of galactic cosmic rays accelerated in supernova remnants

Spectrum and Composition of Ultra-high Energy Cosmic Rays from Semi-relativistic Hypernovae

Spectrum and mass composition of cosmic rays in the energy range 10^15-10^18 eV derived from the Yakutsk array data

Spectrum of cosmic-ray nucleons and the atmospheric muon charge ratio

Spectrum Synthesis Modeling of the X-ray Spectrum of GRO J1655-40 Taken During the 2005 Outburst

SPH simulations of irradiation-driven warped accretion discs and the long periods in X-ray binaries

Spherical Boson Stars as Black Hole mimickers

Spherical harmonics analysis of Fermi gamma-ray data and the Galactic dark matter halo

Spin and Relativistic Phenomena Around Black Holes

Spin down during quiescence of the fastest known accretion-powered pulsar

Spin period evolution of GX 1+4

Spin Period Evolution of Recycled Pulsar in Accreting Binary

Spin Tilts in the Double Pulsar Reveal Supernova Spin Angular-Momentum Production

Spin-down age: the key to magnetic field decay

Spin-down Measurement of PSR J1852+0040 in Kesteven 79: Central Compact Objects as Anti-Magnetars