1. Two examples of non-radiative systems—An application of homogeneous functions to Synge's approximation method

   • Edgar Pechlaner

   Research Articles Pages: 305 - 315

2. SL(2C) invariance of the gravitational field

   • Moshe Carmeli

   Research Articles Pages: 317 - 323

3. The possibility of negative gravitational energy

   • David C. Robinson
   • Jeffrey Winicour

   Research Articles Pages: 325 - 329

4. Gravitational collapse with charge and small asymmetries I. Scalar perturbations

   • Jiří Bičák

   Research Articles Pages: 331 - 349

5. A modified equation of geodesic deviation

   • D. E. Hodgkinson

   Research Articles Pages: 351 - 375

6. On the models of gravitational fields

   • A. Z. Petrov

   Research Articles Pages: 377 - 390

7. Transverse shift by total reflection of a circularly polarised light beam: theory and experimental proof

   • O. Costa de Beauregard

   Research Articles Pages: 391 - 395

8. Curvature collineations

   • P. C. Aichelburg

   Letters to the Editor Pages: 397 - 400

9. Gravitational-electromagnetic resonance

   • V. B. Braginsky
   • M. B. Mensky

   Letters to the Editor Pages: 401 - 402

10. The equivalence of inertial and passive gravitational mass

    • V. B. Braginsky
    • V. I. Panov

    Letters to the Editor Pages: 403 - 404

11. Virtual particles as sources of the gravitational field

    • Leopold Halpern

    Letters to the Editor Pages: 405 - 407

12. Book review

    • Viktor Gorgé

    BookReview Pages: 409 - 410