Two examples of non-radiative systems—An application of homogeneous functions to Synge's approximation method Edgar Pechlaner Research Articles Pages: 305 - 315
The possibility of negative gravitational energy David C. RobinsonJeffrey Winicour Research Articles Pages: 325 - 329
Gravitational collapse with charge and small asymmetries I. Scalar perturbations Jiří Bičák Research Articles Pages: 331 - 349
Transverse shift by total reflection of a circularly polarised light beam: theory and experimental proof O. Costa de Beauregard Research Articles Pages: 391 - 395
Gravitational-electromagnetic resonance V. B. BraginskyM. B. Mensky Letters to the Editor Pages: 401 - 402
The equivalence of inertial and passive gravitational mass V. B. BraginskyV. I. Panov Letters to the Editor Pages: 403 - 404
Virtual particles as sources of the gravitational field Leopold Halpern Letters to the Editor Pages: 405 - 407