LETTER TO THE EDITOR: Exact solution of the double-Kerr equilibrium problem

LETTER TO THE EDITOR: Gravitational instantons

LETTER TO THE EDITOR: Gravitational waves from ultracompact stars: the optical geometry view of trapped modes

LETTER TO THE EDITOR: Gravitational waves with spherical wavefronts

LETTER TO THE EDITOR: Integrability of the Rarita-Schwinger equation

LETTER TO THE EDITOR: Models of regular Schwarzschild black holes satisfying weak energy conditions

Letter to the Editor: SCIPION, a new flexible ionospheric sounder in Senegal

LETTER TO THE EDITOR: Testing Newton's third law using lunar laser ranging

Letter: Quantum Entropy of the Garfinkle-Horowitz-Strominger Dilaton Black Hole

Letter: Weitzenböck Spacetime Outside a Rapidly Rotating Object and the Motion of a Dirac Particle

Letting the Cat out of the Bag: Generation for Shake-and-Bake MT

Level Crossing Rate and Average Fade Duration of Dual Selection Combining with Cochannel Interference and Nakagami Fading

Level Crossing Rate and Average Fade Duration of EGC Systems with Cochannel Interference in Rayleigh Fading

Level Crossing Rate and Average Fade Duration of the Double Nakagami-m Random Process and Application in MIMO Keyhole Fading Channels

Level Crossing Rate and Average Fade Duration of the Multihop Rayleigh Fading Channel

Level Crossing Rates of Interference in Cognitive Radio Networks

Level of Presence in Team-Building Activities: Gaming Component in Virtual Environments

Level Shifter Design for Low Power Applications

Level shifts and inelastic electron scattering in dense plasmas

Levels of Product Differentiation in the Global Mobile Phones Market